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

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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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