Data from Voyager Ⅱ have presented astronomers with a puzzle about why our outermost planet exists.

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问题 Data from Voyager Ⅱ have presented astronomers with a puzzle about why our outermost planet exists.

选项 A、problem
B、mystery
C、question
D、point

答案B

解析 本句意思:旅行者Ⅱ提供的数据给天文学家提出了关于离我们最远的星球存在之谜。problem:问题。mystery:神秘的事,难以解释的事情,它和puzzle同义。question和problem意思相同,都有“问题”的意思,但是搭配不同。我们一般说“to solve a problem”(解决问题),“to answer the question”(回答问题)。
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