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【单选题】
下列牙中不与（牙合）平面接触的牙是A.
上颌中切牙切缘
B.
上颌侧切牙切缘
C.
上颌前磨牙颊尖
D.
上颌尖牙牙尖
E.
上颌第一磨牙近中颊尖
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【单选题】听力原文：M: People shouldn't drop rubbish in a street, should they? W: No, they shouldn't or they would be fined. What would happen if people drop rubbish in a wrong place?
A.
They would be happy.
B.
They would be fined.
C.
Nothing would happen.
【单选题】Nobody should drop out of college _______ they believe they face a chance of a lifetime.
A.
if
B.
otherwise
C.
unless
D.
since
【单选题】Nobody should drop out college ________ they believe they face the opportunity of a lifetime.
A.
unless
B.
as
C.
if
D.
that
【单选题】I believe that nobody should drop out of college unless they believe they face the opportunity of a lifetime.
A.
我认为，除非面临一生难求的机会，任何人都不应该中途退学。
B.
我认为，即使遇到了千载难逢的机会，任何人都不应该退学。
C.
我认为，除非遇到了千载难逢的机会，任何人都应该三思而行。
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