冠词的用法,
题目
冠词的用法,
Nowadays,more and more people have private cars and ____bicycles is no longer___important means of transportation.
A.the ;/ B.the ;an C.a;the D./;/
答案
B
后空是an (an important means of transportation)means尽管单复数一样,但在此为单数.前空the 可有可无.
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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.
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