【題目】Whether lifeon any other planet in the solar system still remains a question.
A.enters
B.exists
C.signals
D.marks

【答案】B
【解析】考查動詞辨析。句意: 太陽系中任何其他的行星上是否存在生命仍是個問題。enter進(jìn)入; exist存在; signal發(fā)出信號; mark做記號。所以選B。

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