单项选择题

Death ensued as a result of suffocation（）

A. heart failure
B. an accident
C. disease
D. asphyxiation

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单项选择题
She is a very（）student. She’s always talking about traveling to outer space.

A. imaginary
B. imaginative
C. imaginable
D. imagining
单项选择题
The survey showed that（）numbers of 15-year-olds were already smoking twenty cigarettes a week.

A. essential
B. steady
C. primary
D. substantial
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