单项选择题

They took ______ measures to prevent poisonous gases from escaping.

A. fruitful
B. beneficial
C. sufficient
D. effective
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单项选择题
To get information related to your study, you’d better pay close attention to ______ .
A. newspapers and magazines
B. the problems and solutions
C. all the areas of your study
D. the suggestions of the teachers
单项选择题
The topic of your investigation must be something______ .
A. from which you can form your report
B. that you are interested in
C. that your teacher approves
D. that you already have in your mind
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