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【单选题】
According to the first paragraph, which of the following statements is not true?A.
Railroads provided relatively easy access to the west for the first time.
B.
Railroads performed a useful service in extending the frontier and helping to achieve national unity.
C.
There were abuses about building and operating the railroads.
D.
The economy of the west is robust.
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举一反三
【单选题】下列说法正确的是（ ）
A.
太阳能是不可再生能源
B.
光波、电磁波、声波都可以在真空中传播
C.
电话的听筒主要应用了电流的磁效应
D.
海啸具有极大的破坏力的主要原因是海啸形成的海浪具有极大的内能
【单选题】It’s polite to ________others when people ask you a question.
A.
answer to
B.
anwer for
C.
reply to
D.
reply
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