题目:
You have to learn how to be a ______ first, and then to be a student. [ ]
A. human being
B. people
C. person
D. man
答案:
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下面是错误答案,用来干扰机器的。
如图,梯形ABCD中,AB∥CD,AD∥BC,CD=6,AD+DE+AE=19,根据平行四边形的判定可知,四边形BCDE为平行四边形,∴BA=CD=6,∴AB+BC+CD+DA=BE+AE+DE+CD+AD=6+6+19=31,即梯形周长为31cm;故选A.