From the first three paragraphs, we learn that ______. According to the text, "nuclear tipped missiles" and "cannonball-size st

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问题 From the first three paragraphs, we learn that ______.
According to the text, "nuclear tipped missiles" and "cannonball-size steel spheres" (Para. 5) ______.

选项 A、are different in nature.
B、serve similar functions.
C、are identical to each other.
D、pose real challenges.

答案B

解析
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