单项选择题
A.purpose
B.sake
C.security
D.running
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单项选择题
A.elementB.concernC.needD.step
A.element
B.concern
C.need
D.step
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单项选择题
What’s a student in his second year called.
A.Senior.
B.Sophomore.
C.Freshman.
D.Junior.
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