单项选择题

The study also notes a steady decline in the number of college students taking science courses.（）

A. continuous
B. relative
C. general
D. sharp

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We explored the possibility of expansion at the conference.（）

A. offered
B. included
C. accepted
D. investigated
单项选择题
The high speed trains can have a major impact on our lives.（）

A. effort
B. problem
C. concern
D. influence
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