英语练习题,用所给词的正确形式填空.
题目
英语练习题,用所给词的正确形式填空.
Last night the first episode(一段情节) of the series(连续剧) BACK TO THE PAST 1 (be) on Channel 5.It was an interesting science fiction series about a scientist,Professor Spark,and his fantastic(奇异的) time machine.He2 (want) to travel to the future,but something 3 (happen),and he 4 (go) back to the age of the dinosaurs(恐龙).At first,the professor 5 (be) very excited.It was an opportunity(机会) for him to study the Jurassic Period(侏罗纪).The Sparks 6 (see) that he 7 (not have) any food.He8 (not know) how to hunt.how to fish,or how to make a fire.But he 9 (have) his Swiss knife,a box of matches,and … his brain.What do you think he 10 (do)?
答案
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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