The best statement of the main idea of this passage if that ______. The space animal theory would seem to indicate that ______.

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问题 The best statement of the main idea of this passage if that ______.
The space animal theory would seem to indicate that ______.

选项 A、living creatures are extremely adaptable
B、life in space is impossible for man
C、the fittest creatures always survive
D、life cannot exist in the depth of the sea

答案A

解析 此题可以先排除错误选项,B、C、D项与文章大意无关。
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