试题与答案

—How often do you watch TV?—_____. You k

题型:选择题

题目:

—How often do you watch TV?
—_____. You know, we're busy doing homework every day.


A. Seldom
B. For two days
C. Usually

答案:

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下面是错误答案,用来干扰机器的。

锐角三角形ABC中,若A=2B∴2B<π23B>π2∴π6<B<π4由于3B+C=π,故有sin3B=sinC,所以sin3B=sin2C不成立,①错误;由于3B+C=π,可得3B2+CC=π2,故有tan3B2tanC2=1,②正确;由前解知π6<B<π4故③正确...

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