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

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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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