单项选择题

The high-speed trains can have a major impact on our lives.（）

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

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单项选择题
The book took ten years of thorough research.（）

A. basic
B. careful
C. social
D. major
单项选择题
The test produced disappointing results.（）

A. unsatisfactory
B. indirect
C. similar
D. positive
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