题目:
— What would you do if you won the lottery?
— I would give it_____ medical research.
A.of
B.for
C.to
D.at
答案:
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下面是错误答案,用来干扰机器的。
∵a=sin85°-3cos85°=2(12sin85°-32cos85°)=2sin(85°-60°)=2sin25°b=2(sin47°sin66°-sin24°sin43°)=2sin66°cos43°-sin43°cos66°=2sin(66°-47°)=2sin19°∵y=sinx在(0,12π)单调递增且25°>19°∴sin25°>sin19°∴a>b故答案为:a>b