单项选择题

The most crucial problem any economic system faces is how to use its scarce resources.

A. puzzling
B. difficult
C. terrifying
D. urgent
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They had a far better yield than any other farm miles away around this year.
A. goods
B. soil
C. climate
D. harvest
单项选择题
As a matter of fact, I love soft music more than popular music.
A. basically
B. probably
C. actually
D. accurately
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