《初一英语百问百答》PDF下载

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  • 作  者:曾敏主编
  • 出 版 社:北京:北京邮电大学出版社
  • 出版年份:1999
  • ISBN:7563503595
  • 页数:228 页
图书介绍:

1.“Good morning,teacher.”可以写成“Teacher,good morning.”吗?(L.1) 1

2.“Sit down,please.”这句中的please可以放在句首吗?(L.1) 1

3.“What's your name?”这句话在什么场合用?(L.1) 1

4.“Hello!”有什么用法?(L.2) 2

5.“How are you,Miss Gao?Fine,thank you.”这两句话有什么用法?(L.2) 2

6.“My name is Han Meimei.”与“My name is Jim Green.”这两句中的姓名表示法相同吗?(L.2) 3

7.“Good morning,Mr Wang!”这句中的Mr Wang能换成Teacher Wang吗?(L.3) 3

8.“What is(What's)this?It is(It's)…”这两句话是什么意思?第二句中的it能否用this代替?(L.4)” 4

9.“Are you Wei Hua?Yes,I am.”“Are you Li Ming?No,I'm not.”这两句中的“Yes,I am.”和“No,I'm not.”能分别写成“Yes,I'm.”和“No,I amn't.”吗?(L.5) 4

10.“This is Wei Hua.”这句中的this is能缩写成this's吗?This is…有何用法?(L.6) 5

11.“Nice to meet you.”这句话是什么意思?有什么用法?(L.6) 5

12.“Fine,thank you.And you?”句中的“And you?”是什么的缩略形式?(L.6) 6

13.“Where is‘A’?”A在哪儿?这句能译成“‘A’is where?”吗?(L.7) 6

14.二十六个字母中有几个元音字母?辅音字母能独立构成单词吗?(L.8) 7

15.“Good afternoon!”用于什么场合?(L.9) 7

16.“Excuse me.”与“Sorry.”用法相同吗?(L.9) 7

18.“Can you spell it,please?”是什么意思?(L.9) 8

17.“How do you do?”与“How are you?”两者有何区别?(L.9) 8

19.“What's this in English?”句中的in是什么词性,有什么用法?(L.11) 9

20.“Goodbye!”是什么意思?(L.12) 10

21.“I'm in Row!I'm Number 2.”这两句中“Row 1,Number 2”能写成“1 row,2 number”吗?(L.13) 10

22.“Hi,Ann!”中Hi有什么用法?(L.14) 11

23.“What class are you in?I'm in Class 3,Grade 1.”这两句中的“what class”能写成“which class”吗?“in Class 3,Grade 1”能写成“in Grade 1,Class 3”吗?(L.14) 11

24.“What's one and two?”是什么意思?怎样回答What's …and…?(L.15) 12

25.“How old are you?”句中的how old有什么用法?(L.15) 12

28.“Is this a pen?”与“What's this?”句型一样吗?(L.18) 13

26.“677803”这个数字表示什么?怎么读?(L.16) 13

27.什么情况下用“Ah,it's a secret!”?(L.16) 13

29.“a pear,an apple”两词前的a和an有何区别?(L.18) 14

30.“What's this?What's that?”这两句中的this,that有何不同?(L.19) 14

31.“Is that an English car?No,itisn't.It's a Japanese car.”这两句中的English,Japanese和Chinese有什么用法?(L.19) 14

32.“Who's this?”句的who有什么用法?(L.21) 15

33.“Its name is Polly.”its和it's如何区别使用?(L.21) 16

34.“I don't know.”这句中的don't有什么用法?(L.21) 16

36.怎样分辨?(L.22) 17

35.如何理解“I think she's twelve.”?(L.21) 17

37.“Is everyone here today?”这句话是什么意思?(L.23) 18

38.“Is she at school today?”与“I think she's at home.”这两句中的at school和at home是什么意思?(L.23) 18

39.“Is Bill in?”此句中的in是什么词性,能换成at home吗?(L.23) 18

40.既然可以说:“She isn't at home.”为什么不可以说“She isn't at here.”?(L.23) 19

41.“Hello!”和“Hi!”有什么区别?(L.23) 19

42.“Hello,Bill?No,this is Sam.”this is…在此句中是什么意思?(L.23) 20

43.“Is your friend a boy or a girl?”是什么疑问句?(L.24) 20

45.“What are these/those?”句中的these和those意思一样吗?(L.26) 21

44.“Is that my cup?”“No,I think it's his cup.”这两句中的my,his有什么用法?(L.25) 21

46.“three buses,five oranges…”名词变复数有何规律?(L.26) 22

47.“It's very good!Thank you.”句中的“Thank you.”在此有何用法?(L.26) 22

48.?books?都对吗?(L.27) 23

49.“Excuse me!Yes?”句中的“Yes?”能译成“是”吗?(L.27) 23

50.“That's all right.”与“That's right.”用法相同吗?(L.27) 24

51.“Say the numbers:one to thirty-nine.”英语中,基数词是怎样构成的?(L.29) 24

52.“Can I see your hcence,please?”句中的see可以换成look at吗?(L.30) 25

54.What team is he in?解释为“他在哪个组”,还是“他参加哪个球队”?(L.31) 26

53.“Here you are.That's all right.”这里的“That's all right.”也能解释为“不客气”吗?(L.30) 26

55.“My teacher's name is Miss Gao.”句中的is能换成am或are吗?(L.32) 27

56.“At school I have a friend.”句中的at school究竟是什么意思?(L.32) 27

57.什么叫重读开音节单词?五个元音字母在重读开音节中分别读什么音?(L.32) 28

58.什么叫重读闭音节单词?五个元音字母在重读闭音节中分别读什么音?(L.32) 28

59.“Who's on duty today?”句中的on duty是什么意思?(L.33) 29

60.“I think they are at home.”这句话改为否定句应怎么说?(L.33) 29

61.“You look the same!”这句话的意思是什么?(L.34) 29

62.“This way,please.”这句话的意思是什么?(L.35) 30

63.“Can you put our coats here?”句中的we和our用法有何不同?(L.35) 30

64.什么叫元音和辅音?什么叫清辅音和浊辅音?(L.36) 31

65.什么叫爆破音?(L.36) 31

66.“The girl in the hat?”句中的in the hat有何用法?(L.37) 32

67.“Are Jim and Li Lei in the same class?”“Are the twins in different classes?”句中的the same,different后面用复数名词还是单数名词?(L.37) 32

68.“Look at the picture.”和“Can you see the door.”两句中的look at和see用法相同吗?(L.38) 33

69.“Can you see the door?”怎样区别the door和a door?(L.38) 33

70.“Is it on the desk?”“Are they on her desk?”能不能说on desk?(L.39) 34

71.介词in,on,at,under,behind表示地点(位置)有何区别?(L.39) 35

72.“It looks like a cat!”句中的look like是什么意思?(L.40) 35

73.“It's a picture of my family.”能改写成“It's my family's picture.”吗?(L.41) 36

74.“What is the name of her cat?”句中的her相当于Kate's吗?(L.41) 36

75.“Go and see,Jim.”与“Please come in.”这两个句子是什么种类的句子?(L. 42) 37

76.在辅音中,[1],[m],[n],[η]分别叫什么音?有何特点?(L.44) 38

77.“I can see a kite.Where's the kite?”这两句中的a与the能互换吗?(L.45) 38

78.“The kite is on the wall.”句中的on能换成in吗?(L.45) 39

79.“I can't find the broom.”句中的find能换成look for吗?(L.46) 39

80.“I can't find the broom.Can you see it?Yes,I can.It's behind the door.”两句中的it用法相同吗?(L.46) 39

81.“Class Three have a map.”如何理解句中的have?(L.47) 40

82.“Let's look at it.”句中的look前可加to吗?(L.47) 41

83.“Where's Wuhan?Do you know?”把两句合并成一句应怎么说?(L.47) 41

84.“It's your turn now.”为什么说“your turn?”(L.48) 42

85.“What colour is it?”what是什么词类?(L.49) 43

86.“Which man?The one in the white car.”问句中的which能改用where吗?one有什么用法?(L.50) 43

87.“Can't you see?Yes,(I can.)”“Can't you…?”表达一种什么语气?(L.51) 44

88.“Colour it green,please!”为什么不说“Colour it with green.”?(L.52) 45

89.在辅音中,哪两个音叫半元音?(L“52) 45

90.“What colour are Jim's trousers/Kate's shoes?”只有shoes,trousers用复数吗?(L.53) 45

91.“Whose is this shirt?”与“Whose shirt is this?”意思相同吗?(L.54) 46

92.“I think it's hers.”句中的hers能换成her's吗?(L.54) 47

93.“Jim,is this yours?Yes,it's mine.”两句中的yours与mine有什么用法?(L.54) 47

94.“It'smy blouse.It's mine.”对句中的my和mine提问所用的句型结构一样吗?(L.55) 48

97.“They are yours.”“你的”,“你们的”都用yours吗?(L.56) 49

96.“Put them on,please.”句中的“Put them on.”可以写成“Put on them.”吗?(L.55) 49

95.“Whose?The twins’?”句中的twins’能写成twins's吗?(L.55) 49

98.在辅音中,哪些属于摩擦音?有何特点?(L.56) 50

99.“Give it to Mr Hu.”这句话能写成“Give Mr Hu it.”吗?(L.57) 51

100.你知道书上写的34—34=0英语怎么说?(L.57) 51

101.“What's the time?”能写成“What time is it?”吗?(L.58) 52

102.“What's the time?It's six o'clock.”什么叫o'clock?(L.59) 52

103.“Excuse me.What's the time,please?”中Excuse me用于哪些场合?(L.59) 53

106.“Bingo—Finished!”怎么解释?(L.59) 54

105.“It's time to go to bed.”句中的第一个to能换成for吗?(L.59) 54

104.“I must go home.”这句中go和home之间能否加上介词to?(L.59) 54

107.“Put your shoes on.”和“Put on your shoes.”这两句话的表达都正确吗?(L.60) 55

108.在辅音中,哪些属于破擦音?(L.60) 55

109.“What's on the floor—is it a hat or a cat?”后一句是选择疑问句吗?(L.61) 56

110.“Who's behind the door?”句中的who's与whose表达意思相同吗?表示位置的介词必须和be连用吗?(L.62) 56

111.如何理解“Look,here are my father and mother.”这句话?(L.63) 57

112.“They look young!”句中的look是什么意思?(L.63) 58

113.“Is it your sister,Kate?”it能换成she吗?(L.63) 58

115.英语中,元音有多少个?怎样分类的?(L.64) 59

114.“Sorry,I don't have a watch.”句中的don't have是否等于have not?(L.64) 59

116.“Are we all here today?”句中的all有什么用法?(L.65) 61

117.“This box is big.”这句话是什么意思?(L.65) 61

118.“Could I have a full one,please?”这句话的意思是什么?(L.65) 62

119.“I want to take some books to the classroom.”句中的want和take有什么用法?句中的两个to有何区别?(L.66) 62

120.“The box is heavy.Can you carry it?”句中的carry和take有什么区别?(L.66) 63

121.“Thanks.You're welcome.”这两句是什么意思?(L.66) 64

122.“There!OK?”单独用一个there是什么意思?(L.67) 64

124.“Put the basket over there.”既然有over there,可否说over here?(L.67) 65

123.“Dad,we can't put this basket in the car.The car's too full.”full有什么用法?(L.67) 65

125.“What about this blue one?”句中的what about有什么用法?(L.68) 66

126.“Let me have a look.”句中的have a look作何解释?(L.68) 66

127.“But it's an old one.”与“Is it too small?”两句中的old与small的用法相同吗?(L.68) 67

128.元音字母a在单词中一般有几种发音?al,ay字母组合在单词中的拼读规则是什么(L.68) 67

129.“Where are his football clothes?”句中为什么要用are?(L.69) 68

130.“Where's the other one?”句中的other前不用the行吗?(L.69) 69

131.“Put them away,please.You must look a'fter yourthings.”这两句中的away与after词性一样吗?(L.69) 69

132.“I want my kite.It's in the tree.”句中的in能换成on吗?(L.70) 70

133.“It is broken?”句中的broken是什么词类?有何用法?(L.70) 70

134.“I don't think so.”是什么意思?(L.70) 71

135.“Here you are.Catch!”这里的catch有什么用法?(L.70) 71

136.“What's wrong with it?”这句话是什么意思?(L.71) 72

137.“It is broken.”“Can you mend it?”两句中的it用法相同吗?(L.71) 72

138.什么情景下说“Oh dear!”和“Thank goodness!”?(L.72) 73

139.辅音字母c和g在单词中有什么不同的读音?字母组合ck和ch在单词中读什么音?英语单词中有些字母不发音吗?(L.72) 73

140.“一杯茶”怎样表达?“三杯茶”又怎么表达呢?(L.73) 74

141.“Would you like something to drink?”与“Do you want something to drink?”有什么不同?(L.74) 75

142.“I think I'd like a bottle of orange.”like与would like有何区别?(L.74) 76

143.“How many bottles of orange can you see?.”句中的orange为什么不用oranges?(L.75) 76

144.“I can see only one.”怎样看待only的词类?(L.75) 77

145.“I can't see any.”句中的any能换成some吗?(L.75) 78

146.some和复数名词/单数名词的关系是怎样的呢?(L.76) 78

147.元音字母e在单词中的不同读音是什么?字母组合ee和ea在单词中发什么音?(L.76) 79

148.“Are you OK?Yes,I'm fine.Please don't worry!”Please don't worry…是一句固定的习惯用语吗?(L.77) 80

149.“Do you want a go?”句中的go是什么意思?(L.78) 80

150.“Don't throw it like that.Throw it like this.”两句中的like是什么词性?什么意思?(L.78) 81

151.“Can you play foolball?”句中的football前能加冠词吗?(L.78) 82

152.“Can you do it?Yes,I can.It's easy./No,I can't.It's too hard.”句中的do,easy和hard有何用法?(L.78) 82

153.“Run with it like this.”with与and用法一样吗?(L.79) 83

154.“There is a picture on the wall.”这句话是什么意思?句中的on the wall能换成in the wall吗?(L.79) 83

155.There is/are后面跟哪些方向性介词?(L.79) 83

156.“They are near the river.”怎样正确理解near的用法?(L.79) 84

158.元音字母o以及由o组成的一些字母组合在单词中发什么音?(L.80) 85

157.“Let your kite fly high!”句中的fly high是固定词组吗?(L.80) 85

159.“There is a boat in the river.”对句中的a boat提问应怎么说?(L.81) 86

160.“In the tree there is a bird.”There is的疑问句可以用倒装句吗?(L.81) 87

161.“Is there a map on the wall?”这句话是there be句型的什么结构形式?(L.81) 87

162.“Are there any birds in the picture?”any怎样同复数名词连用呢?(L.82) 88

163.“How many boats are there in the picture?”句中的are there能写成there are吗?(L.82) 89

164.“How many houses are there in the picture?There is only one.”houses怎么读?名词复数的读音有何规律?(L.82) 90

165.“How many children are there?”句中的children是什么形式的词?(L.83) 91

167.“Where are they?They're at school.”at school与at the school用法相同吗?(L.83) 92

166.“There is only one girl in Picture 3.”对句中的one提问应怎么说?(L.83) 92

168.“Where are they?They're at work.”at work与work用法一样吗?(L.83) 93

169.“Are there any children in the room?”怎样把含some的句子变为疑问句?(L.84) 93

170.以[t],[d]结尾的单词加s分别怎么读?(L.84) 94

171.“What are you doing?I'm listening to her.”句中的doing,listening是什么形式的词?(L.84) 94

172.“I'm listening to her.”对句中的her提问应怎么说?(L.85) 95

173.“She's doing her homework.”句中的is能丢掉吗?(L.86) 95

174.“What's he doing?He's watching TV.”这两句中的动词是什么时态?后一句中的watching能换成seeing吗?(L.86) 96

176.“Are you playing football?”这一句型是用在什么情况下?(L 86) 97

175.n结尾的动词的现在分词一定要写成nning吗?(L.86) 97

177.“You're not talking.”not应放在什么位置?(L.87) 98

178.“They're running up the trees.”对句中的are running up the trees提问应怎么说?(L.87) 99

179.“They're working near the house.”对句中near the house提问应怎么说?(L.87) 99

180.“What are they wearing?”句中的wear与put on 的用法相同吗?(L.88) 100

181.“No sweater?”句中的no能换成not吗?(L.88) 101

182.y在单词中有几种发音?ey字母组合呢?(L.88) 101

183.“Could I have some bottles of milk,please?”“Could I have……?”作何解释?(L.89) 101

184.“Where's the food?There isn't any food.”句中的is可以换成are吗?(L.89) 102

185.“Yes,they're our new reading books.”句中的our new reading books是按什么顺序排列的?(L.90) 103

186.怎样回答附加疑问句?(L.90) 103

187.“I want some help.”为什么不可以说some helps,而要说some help?(L.91) 104

188.“I'm coming now.”表达什么意思?(L.91) 104

189.“One of the boys is English.”句中的谓语is能换成are吗?(L.92) 105

190.“All the other boys are Chinese.All of the Chinese students are Young Pioneers.”两名中的all与all of有什么用法?(L.92) 105

191.difference与different的用法有什么不同?(L.92) 106

192.“It's Monday.”对Monday提问应用什么疑问词?(L.93) 106

193.“I think the shop is closed at this time of day.No,I think it's open.”这两句中的closed与open有什么用法?(L.94) 107

195.“Can I borrow it,please?”句中的borrow有什么用法?(L.94) 108

196.“But please give it back soon.”句中的back是什么词性?(L.94) 108

194.“Do you have one eraser?Yes,I do.”句中的have与there be的用法相同吗?(L.94) 108

197.“Do you have a ruler?Yes,I do.”have的疑问句和否定句等怎样构成?(L.95) 109

198.“Thanks a lot.Not at all.”这两句话是什么意思?(L.95) 111

199.还有其它表达可代替thanks very much吗?(L.95) 111

200.元音字母i,u及字母组合igh的读音分别是什么?(L.96) 112

201.“Where's he from?”这句话是什么意思?(L.97) 112

203.“Washington D C”标点如何使用?(L.97) 113

202.是否可以说:Where is he.r cat from?(L.97) 113

204.“Americans come from America.”Americans是American的复数吗?(L.98) 114

205.“They speak English and French.”句中的speak能换成say吗?(L.98) 114

206.“Do you speak French?Yes,we do.”句中的两个do能换成are吗?(L.98) 115

207.“How do you like China?Very much.”这两句话是什么意思?(L.98) 115

208.a little有什么用法?(L.98) 116

209.“What do you like about China?The people—and the food.”这两句话是什么意思?(L.98) 116

210.“How do you like…”和“What do you like about…”两个句型表达的意思一样吗?(L.98) 116

211.“Do they have many friends?”many与much用法有何不同?(L.99) 117

212.英语书信的格式应怎样写?(L.99) 118

213.“Lucy and I go to school five days a week.”句中的Lucy and I能写成I and Lucy吗?(L.99) 119

214.“We stay at home on Saturdays and Sunday.”句中的on能换成in吗?(L.99) 120

215.“The Chinese people are very friendly.”句中的friendly是副词吗?(L.99) 120

216.“The Chinese people”和“Chinese people”哪一个对?(L.99) 121

217.“The postcard is from Jo to Lily.”句中的from…to…是什么词类,有什么意思?(L.99) 121

21 8.“They teach us Chinese and we teach them English.”句中的us和them能用our和their代替吗?(L.99) 122

219.“Do you like Chinese food?Yes,I do.”怎样理解句中的do?(L.100) 122

220.“Welcome to our home.”中的welcome是动词吗?(L.100) 123

221.“Han Meimei likes bananas a lot.”如何理解句中的likes和a lot?(L.101) 124

222.“but she doesn't like eggs at all.”句中的at all能写成a little吗?(L.102) 125

223.“Uncle Wang likes making things.”句中的making是动词的什么形式?(L.103) 126

224.“Today he is making a machine.”现在进行时有什么用法?(L.103) 127

225.“Listen to the tape.”listen to,listen和hear的区别如何?(L.103) 128

226.“I like eggs,meat,rice,bread and pears.”“Mike doesn't like rice,bananas,eggs or bread.”这两句中的and和or可以互换吗?(L.104) 128

227.a lot,a lot of,lots of三者用法有何不同?(L.104) 129

228.辅音字母组合ch,sh,th,wh的读音分别是什么?(L.104) 129

229.“What does he do?Chen Feng is a farmer.”这两句话有什么用法?(L.105) 130

230.“He works on a farm.”句中的on能换成in或at吗?(L.105) 131

231.“Where does Zhou Nan teach?She teaches in a school near here.”句中的in a school与at school有何区别?(L.105) 131

232.“What do you do?”两个do用法一样吗?(L.106) 132

233.“My friends's mother is a teacher.”对句中的a teacher提问应用疑问词Who还是What?(L.107) 133

234.“Li Fen and Mr Green are talking.”talk,speak,tell,say四个词有何区别?(L.107) 134

235.“Do you have any children?”any后面一定要接复数名词吗?(L.107) 135

236.“Are they with you in China?Yes,they are.”with在此句中表达什么意思?(L.107) 135

237.“Are you all in the same school?No,we aren't.The children go to a different school.”same和different有何用法?(L.107) 136

238.“He goes to Chinese classes every week.”句中的every week前能用介词吗?(L.108) 137

239.现在进行时有哪些用法?与一般现在时有何区别?(L.108) 138

240.以元音字母a,e,i,o,u同字母r构成的r音节的读音分别是什么?(L.108) 139

241.“Jim,what day is it toady?”句中的today与“What day is today?”中的today词性一样吗?(L.109) 140

242.“Don't speak to me now,Kate.”speak后面要加to吗?(L.109) 140

243.“On weekdays,what time do you have breakfast?”句中的breakfast前能用冠词吗?(L.109) 141

244.“On weekdays,what time do you leave home?”句中的leave可以换成away吗?(L.109) 141

245.We have lunch in the middle of the day.这句话是什么意思?(L.110) 142

247.“I get to school at about 7∶30 every day.”句中的every day为什么不能与现在进行时连用?(L.111) 143

246.“He's taking off his clothes and going to bed.”take off的反义词是什么?(L.110) 143

248.“We begin clases at 8∶00.”at与on,in的用法有什么不同?(L.111) 144

249.“We begin classes at 8∶00.”begin与start用法有什么不同?(L.111) 144

250.“I often watch TV,but sometimes I read.”怎样区别often,sometimes,usually,always等词的程度?(L.111) 145

251.“I go to school by bike.”句中的by bike是什么意思?(L.111) 146

252.“In the afternoon,classes are over at 3∶30.”句中的over是什么词性(L.111) 146

253.“I go to bed at about 10∶00.”对句中at about 10∶00提问应怎么说?(L.111) 147

254.“The shop near the school sells books and things like that.”对near the school提问应怎么说?(L.113) 147

255.“How much is the pen?”句中的how much用来对什么提问?(L.113) 148

256.“I want to go shoppmg.”句中的go shopping是什么意思?(L.114) 148

257.“Can you come with me,please?”'come with和go with是否都可以用?(L.114) 149

258.“You can help me carry the things.”句中的carry能换成to carry吗?(L.114) 149

259.“Can I help you?”有什么用法?(L.114) 150

260.“I want two kilos of pears,please.”对句中的two和two kilos of提问分别应怎么说?(L.114) 150

261.“Is that all?”这句话是什么意思?(L.114) 151

262.“Some of them are very cheap.”句中为什么用are而不用is?(L.115) 151

264.“You can often buy things from their shop on your way home.”句中的home前能加上to吗?(L.115) 152

263.“They work all day.”all day只能当副词词组使用吗?(L.115) 152

265.“But don't forget your things early in the morning.”early in the morning表达什么意思?(L.115) 153

266.“Can I help you?”这个句型答语一般有几种?(L.116) 153

267.“Thank you.”在哪些场合下使用?(L.116) 154

268.什么叫辅音连缀?(L.116) 156

269.“Can I have some meat?”句中的some有何用法?(L.117) 156

270.“I'm going to the shops.”这句话是什么意思?(L.117) 157

271.“You can help me do the shopping.”句中的do the shopping可以换成go shopping吗?(L.117) 157

273.“He's working on a machine.”怎样理解并使用work on?(L.118) 158

272.“And we can have a drink of orange,too!”句中的have a drink of orange可以写成have a bottle of orange吗?(L.117) 158

274.“I make a lot of different machines.”句中的a lot of可以换成many吗?(L.120) 159

275.“Who do you make them for?”句中的for能省去吗?(L.120) 159

276.“I make them for workers and farmers.”对句中的I和对workers and farmers提问,所用的句型结构是否一样?(L.120) 160

277.“What do the farmers do with your machines?”句中的with能改成in吗?(L.120) 160

278.“That's good!”good,fine,nice和well用法上有何异同?(L.120) 161

279.“No,the factory is very near my house.”句中的house与home,family的用法有什么不同? 162

跟踪练习 163

跟踪练习答案 194

附录 课本习题答案 196