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【单选题】
防止右心室血液逆流的是( )A.
二尖瓣
B.
三尖瓣
C.
肺干瓣
D.
动脉导管
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皮皮学刷刷变学霸
举一反三
【单选题】不引起呼吸道感染的一组病毒是
A.
麻疹病毒、EB病毒
B.
风疹病毒、ECHO病毒
C.
流行性乙型脑炎病毒、轮状病毒
D.
冠状病毒、腮腺炎病毒
E.
腮腺炎病毒、呼肠病毒
【单选题】What do the French writer's words really mean?
A.
Writers are usually interested in fashion.
B.
Fashion magazines can provide writers with plenty of materials.
C.
Fashion can reflect the life style. of a society.
D.
Fashion is the prime component of a society.
【简答题】Employees at h______ jobs have to carefully weigh up the employer's words and closely watch their expression.
【单选题】—What do you often have for breakfast?—Usually I have some milk and bread; ______ I have some noodles instead.
A.
some times
B.
at times
C.
all the time
D.
at one time
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