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The high-speed trains can have a major impact on our lives.
A:effort
B:problem
C:influence
D:concern
B:problem
C:influence
D:concern
参考答案
参考解析
解析：本句意思：高铁对我们的生活有很大的影响。impact意为“影响”，与influence（影响）意 思相同。effort努力；problem问题；concern关心。
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tolerantB
uncertainC
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doubtful
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