猜一猜下面的英语谜语
题目
猜一猜下面的英语谜语
1.What kind of dog doesn't bite or bark It's_______.
2.What a room has no waiik,on doors,no windows and no floors?It's______.
3.What has hands but no feet,a face but no eyes,tells but not talk?It's______.
4.What is biack when it is clean and white when it is dirty?It's______.
答案
1.hotdog 热狗
2、mushroom 蘑菇
3、clock 钟
4、Blackboard 黑板
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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