飞行PDF电子书下载

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A Before Reading 1

1 Air and Gravity 3

2 Birds 8

3 Kites 15

4 Boomerangs 17

5 Balloons 18

6 Airships 21

7 Parachutes 23

8 Hang-gliders 25

9 Gliders 26

10 Powered Flight 29

B While Reading 33

11 Helicopters 35

12 Jet Aircraft 37

13 Supersonic Areoplanes 39

14 Vertical Take-off 40

15 Hovercraft 41

16 Flying an Aeroplane 42

17 Wings 46

18 Speed 49

19 Flight and Gravity 50

20 Space Flight 51

C After Reading 51

Points for Understanding 53

Answer Key 59

新标准中小学分级英语读物 64

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