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【单选题】
Both carbonic acid and glycine are diprotic, as they can give up ______ protons.A.
one
B.
two
C.
three
D.
four
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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】______ nobody was willing to vote for her, she decided to drop out of the election.
A.
Seen that
B.
So that
C.
Seeing that
D.
When 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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