题目内容
_______ is known to us, the dragon stands for China ______the bear symbolizes Russia.
| A．It; but | B．As; while | C．What; while | D．It; when |
B
解析试题分析：句意：众所周知，龙代表中国而熊代表俄罗斯。第一空是as引导非限制性定语从句，it应该做形式主语，what应该引导主语从句，第二空用while表示对比“然而”，所以选B。
考点：考查非限制性定语从句和连词
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| A．since | B．if | C．unless | D．until |
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| A．while | B．when | C．after | D．before |
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| A．as | B．until | C．while | D．when |
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