He said that books on______popular science are in______short supply.

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问题 He said that books on______popular science are in______short supply.

选项 A、the; a
B、/; /
C、/; the
D、the; the

答案B

解析 本题考查冠词用法。popular science为“大众科学”;in short supply为“短缺,紧缺”,答案为B。
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