It has been about______years since man succeeded in making rain. Which of the following methods can make rain?

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问题 It has been about______years since man succeeded in making rain.
Which of the following methods can make rain?

选项 A、Killing pigs and sheep.
B、Blowing a stream of water into the air from a kind of pipe.
C、Shooting guns or causing explosions.
D、None of the above is right.

答案D

解析 事实细节题。题目询问何种手段可以降雨。根据首段第二句和第二段首句中的claimed(声称),可知这些降雨的手段都不是真实的。
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