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 puzzle:谜。mystery:谜。His death has remained a puzzle. 他怎么死的至今还是个谜。 It was a mystery how the burglars got in. 盗贼怎么进来的是个谜。problem:问题。We have lots of problems to solve.我们有许多问题要解决。question:问题。The clever student asked the teacher an extremely difficult question.那个聪明的学生问了考师一个极其难的问题。 point:论点。The point that I want to make here and now is that Ph. D. dissertations must be original.此时此地我想要说的一点是博士论文必须具有原创性。
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