1.She lived in the mountain village ___the years 1940-1950.
题目
1.She lived in the mountain village ___the years 1940-1950.
a.between b.during c.in d.since
2.The American Civill War lasted four years before the north won ____the end.
a.by b.at c.in d.on
3.May had finished her homework ____the time I got home.
a.until b.by c.at d.when
4.We stayed at the lab ____our teacher returned.
a.till b.by c.during d.while
5.Don't worry.He will return ____.
a.before long b.long before c.long long ago d.long ago
答案
B
C
B
A
A
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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