What's the topic of the text? A. The dangers of rockets. B. The development of rockets. C. The advantages of rockets. D. The invention of rockets, 题目和参考答案——青夏教育精英家教网—

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5. What's the topic of the text?

A. The dangers of rockets.

B. The development of rockets.

C. The advantages of rockets.

D. The invention of rockets,

5. B

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2. A. worked B. based C. lived D. written

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