If we work hard,we can earn ( ) money.if we save a lot,we should give ( )
题目
If we work hard,we can earn ( ) money.if we save a lot,we should give ( )
A a lot a lot B a lot of a lot of C a lot of a lot D a lot a lot of
答案
C
a lot of +可数名词或者不可数名词
a lot 可以修饰动词.
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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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