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【单选题】
无绝缘轨道电路在分界处( )钢轨绝缘,轨道电路电流采用不同信号频率。A.
不设置
B.
设置
C.
有时设置、有时不设置
D.
看情况而定
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举一反三
【单选题】The writer thinks that teenagers are frightened when they are in charge of themselves because______.
A.
they don't know how to stop a car without brakes
B.
there is no one to ask for help when in trouble
C.
there is no one to guide and discipline them
D.
they are afraid of being left alone
【单选题】D The Cost of Higher Education Individuals (个人) should pay for their higher education. A university education is of huge and direct benefit to the individual. Graduates earn more than non-graduates. M...
A.
taxpayers
B.
pressing calls
C.
college graduates
D.
government resources
【单选题】He holds that education should place more ______ on logic thinking, and education of emotion is of little use.
A.
importance
B.
significance
C.
stress
D.
emphasis
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