His family usually eat dinner ____ 6:30 in the morning.A. about B. around C. at around D.about arou
题目
His family usually eat dinner ____ 6:30 in the morning.A. about B. around C. at around D.about arou
A. about B. around C. at around D.about around
答案
C ,在几点钟应该用介词at,around这里是副词,相当于about,“大约”的意思
他们家经常在早晨6点钟吃饭（dinner一般指正餐,午餐或晚餐,所以这里肯定有问题）
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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