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

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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