The survey showed that______numbers of 15-year-olds were already smoking twenty

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问题 The survey showed that______numbers of 15-year-olds were already smoking twenty cigarettes a week.

选项 A、essential
B、steady
C、primary
D、substantial

答案 D

解析本题中，essential的意思是“本质的”；steady的意思是“稳定的”；primary的意思是“主要的，初步的”；substantial的意思是“大体上，基本上，实质的，坚固的”。四个选项中只有D项符合题意。

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