单项选择题
Almost all economists agree that nations
gain
by trading with one another.
A. work
B. profit
C. rely
D. prove
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单项选择题
A. search B. learning C. teaching D. dialogue
A. search
B. learning
C. teaching
D. dialogue
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单项选择题
Desert perennials lose their leaves after the rainy season just as trees lose theirs in wetter climates before winter arrives, but the reasons for this feature are different.
A. Right
B. Wrong
C. Not ment
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