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【单选题】
下列各骨中，属于典型长骨的是A.
锁骨
B.
肋骨
C.
跟骨
D.
指骨
E.
胸骨
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反馈参考答案：
举一反三
【单选题】A consultant engineer at NASA points out that using aircraft acting as the first Stage provides several advantages over a throw-away booster rocket.
A.
Y
B.
N
C.
NG
【简答题】____是引起牙髓感染的常见原因。
【单选题】Despite the wonderful acting and well- developed plot the ______ movie could not hold out attention.
A.
three - hours
B.
three - hour
C.
three - hour's
D.
three - hours'
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