通俗科技英语文选 第1辑PDF电子书下载

Contents 1

What Do We Mean When We Speak of a Calorie? 1

Earth Resources Technology Satellite(ERTS) 3

Malaria Is on the Rise Again 8

A New Industry Goes Back to Nature 11

Soil Erosion 17

Li Shih-chen 26

How Did Man First Tell Direction? 34

The Story of a Raindrop 35

Types of Cancer 38

What Is Our Main Source of Energy? 40

Albert Einstein 45