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【判断题】
楼梯楼层平台的主要作用是缓解疲劳和转换方向。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】The U.S. Constitution takes precedence over
A.
a provision in a state constitution or statute only.
B.
a state supreme court decision only.
C.
a state constitution, statute, or court decision.
D.
none of the above.
【判断题】It is possible for the U.S. to gain from trade with Germany even if it takes U.S. workers fewer hours to produce every good than it takes German workers.
A.
正确
B.
错误
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