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【单选题】
关于血管发生的描述哪项错误( )A.
来源于中胚层
B.
胚外和胚内同时发生
C.
胚外和胚内经体蒂彼此沟通
D.
胚体原始血管左右对称
E.
早期血管的结构无动脉和静脉之分
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反馈参考答案：
举一反三
【简答题】Ninety-five percent of Americans sleep seven to eight hours a night. The rest seem to need more than nine hours, or get along nicely on less【1】six. What distinguishes the long and short sleepers...
【判断题】坚持人民主体地位是依法治国的基本原则,必须把党的领导贯彻到依法治国的全过程之中;依法治国的主体是人民,必须保证人民的广泛参与,决不搞西方国家少数入主导的精英法治。( )
A.
正确
B.
错误
【简答题】People who averaged fewer than seven hours of sleep per night in the weeks before being exposed to the cold virus were nearly three times as likely to get sick as those who averaged eight hours or mor...
【单选题】How many hours of sleep does the woman usually get?
A.
Four.
B.
Five.
C.
Eight.
D.
Ten.
【简答题】改错。要求和上题一样。 Five hours of sleep are not enough.
【单选题】Sleep: Jerry gets hours of sleep a night. Sometimes he can sleep for a week and then not sleep for two or three or four days.
A.
four or five
B.
four to five
C.
four or six
D.
four to six
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