问答题

S4. What significance do the experiments at the Rocky Mountain Arsenal have

【参考答案】

They may have practical value in controlling earthquakes．
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S2. Why do scientist make intensive researches into the faults
单项选择题
You ______ your own sandwiches. I have enough for two.
A．couldn't have brought
B．mustn't have brought
C．shouldn' t have brought
D．needn' t have brought
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