单项选择题

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

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

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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
单项选择题
We have to act within the existing legal framework.（）

A. limit
B. procedure
C. status
D. system
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