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【单选题】
与下颌管关系密切的牙齿是A.
下颌第一前磨牙
B.
下颌第二前磨牙
C.
下颌第一磨牙
D.
下颌第三磨牙
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【简答题】协同运输在物质跨膜运输中属于 类型。
【单选题】I'm always early in the office, ______?
A.
be not I
B.
am not I
C.
aren't I
D.
isn't I
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A.
． curious
B.
． nervous
C.
． mysterious
D.
． sad
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【简答题】The couple __________.I really don’t know why. A．always quarrel B．are always quarreling C．have always quarreled D．have always been quarreled
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