题目:
— Mum, would you please buy me an MP5 player?
— If you can help do some housework the whole vacation, you ____ have one as a reward.
A.must
B.need
C.would
D.shall
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D解析:脑干由延髓、脑桥和中脑组成。脑干背面与小脑相连。脑干从上到下依次有第Ⅲ~Ⅻ对脑神经根出入。