2. 外语
  3. The sun must be made of lighter stuff than the earth. If the earth were______, it would weigh four times as much.

The sun must be made of lighter stuff than the earth. If the earth were______, it would weigh four times as much.

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问题 The sun must be made of lighter stuff than the earth. If the earth were______, it would weigh four times as much.
选项 A、bigger
B、smaller
C、as bigger
D、as big as the sun
答案D
解析 本题考查形容词的比较级，根据题意，太阳一定是由比地球轻的物质构成的，如果地球和太阳一样大，它会是太阳四倍那么重。前一分句的提示已经很明确，比较的是地球和太阳的重量；而第二分句的虚拟语气提示我们，此句是一个假设"如果地球和太阳一样大"，所以D正确；后面的句子是个省略句，补足应为：it(the earth)wouldweigh four times as much as the sun．
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