单项选择题

We work to make money, but it's a ______ that people who work hard and long often do not make the most money.

A. dilemma
B. conflict
C. prejudice
D. paradox
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单项选择题
The ______ talks between China and the United States were the base of the later agreement.
A. original
B. primary
C. initial
D. primitive
单项选择题
If a substance is dissolved in water or heated, it may ______ a gas. A give into B. give over C. give off D. give away
If a substance is dissolved in water or heated, it may ______ a gas.
A give into B. give over C. give off D. give away
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