After the earthquake,thousands of PLA took part in the rescue____they had a race with time.
题目
After the earthquake,thousands of PLA took part in the rescue____they had a race with time.
a.which
b.that
c.where
d.when
答案
c,where引导一个定语从句.在那里,他们将展开一场与时间的赛跑.
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．
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