go off表示灯关 那么go on可表示灯开吗?
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go off表示灯关 那么go on可表示灯开吗?
摔倒在马路上或地上是 fall on the floor/road还是fall down on the floor/road Our president tells us any news in the mornings on Mondays.这句子有错吗?We meet as a whole school in the morning once a week on Fridays.中morning要复数吗?还有The president tells us any news once a week on Mondays.中为什么要用any而不用some,用some也可以吗?Class teachers meet the class and check who is present and absent at the beginning of the day.此句中我认为class用复数,and改为or也没有问题,
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举一反三
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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