[G] Without the magical propellants of sci-fi?space travel, we have to rely on chemical rockets to power our spacecraft. Whether their fuel is solid or liquid, the principle is the same: the space vehicle goes off like a firework rocket. Hot exhaust gases thrusting downwards blast the spacecraft beyond the pull of Earth s gravity and towards its target.
Orders:
G 21. 22. 23. 24. 25. F
参考答案
Part A
Text 1: 1. D 2. D 3. C 4. B 5. B
Part B
21. D 22. A 23. E 24. C 25. B
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