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3. 为了将来某天把宇航员送上火星，许多科学家正在努力 工作。

Lots of scientists are working hard  send astronauts to Mars one day.

3. in order to

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②(2014 •镇江中考—Where is your son Jimmy living now?

—He the city of Zhenjiang,China for two years.

   A. has been in   B. has been to

   C. has gone to   D. has come to

16. (v.) 运动；锻炼

17. (adv.) 可能;也许

6. 数以十亿计 of

7. 与……交流 communicate

3. (n.) 耳朵

4. (adj.) 情绪不安的，紧张的

5. We all know that (光) travels faster than sound.

选择already/yet填空。 

① He has not begun to work.

(2) - Have you had your lunch?

—No,not .

③I have finished my homework.

1. hero (n. )→  (pl.) 英雄

2. humour (n. )→  (adj.) 幽默的；滑稽的

③ 到了我们说再见的时间了。

It's time us goodbye.

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