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【单选题】
关于月经的描述，错误的是A.
月经是生殖系统周期性变化的标志
B.
青春期月经通常有无排卵现象
C.
月经周期只要恒定属于正常
D.
月经周期的长短是由黄体期长短决定的
E.
月经量一般超过80ml为异常
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【单选题】A report consistently brought back by visitors to the U.S. is how friendly, courteous, and helpful most Americans were to them. To be fair, this observation is also frequently made of Canada and Canad...
A.
rude taxi drivers are rarely seen in the U.S.
B.
small-minded officials deserve a serious comment
C.
Canadians are not so friendly as their neighbors
D.
most Americans are ready to offer help