A、a recurrent theme B、to keep ahead of scientific advances C、reading books of science fiction D、political implications E、a curre

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问题 A、a recurrent theme
B、to keep ahead of scientific advances
C、reading books of science fiction
D、political implications
E、a current theme
F、read worldwide
Writers find it difficult________.

选项

答案B

解析 本句比较简单,定位到第五段的首句,即可找出答案。
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