试题与答案

Peter was so excited _____he received an

题型:选择题

题目:

Peter was so excited _____he received an invitation from his friend to visit Wuxi.

A.where

B.that

C.why

D.when

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E解析:椎骨包括椎体、椎弓和突起;分为颈椎、胸椎、腰椎、荐椎和尾椎。颈椎一般有7个。牛羊胸椎13个,猪14或15个,马18个,犬猫13个;牛马腰椎6枚,猪羊6或7枚。牛马荐椎5枚,猪羊4枚,犬猫3枚,是构...

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