单项选择题

If a substance is dissolved in water or heated, it may ______ a gas.

A. give away
B. give in
C. give off
D. give back
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单项选择题
Everything in the universe undergoes ______ development and change.
A. continuous
B. continual
C. continued
D. constant
单项选择题
Any problem you can solve with a check is not a problem. It is a(n)______.
A. price
B. expense
C. money
D. annoyance
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