问题 不定项选择

铁路在弯道处的内外轨道高低是不同的,已知内外轨道对水平面倾角为θ,如图所示,弯道处的圆弧半径为R,若质量为m的火车转弯时速度小于,则:

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A.内轨对内侧车轮轮缘有挤压

B.外轨对外侧车轮轮缘有挤压

C.这时铁轨对火车的支持力小于mg/cosθ

D.这时铁轨对火车的支持力大于mg/cosθ

答案

AC

完形填空

第二节 语法填空(共10小题,每题2分,共20分)

仔细阅读下面短文,短文中有10个空格。请按照语境以及括号里的具体要求完成语法填空、词形变化等。答案填写在答题卡标号为16—25的对应位置。

The holiday’s upon us. After months of study, you have some time to yourself. So, why not read a book? Well, some people will say, ‘Why trouble with books? We have the Internet and 16        media that offer a lot more 17       (colour) programs. Books are history!”

But don’t be fooled. There’s still a lot to be said for reading and reading as widely as possible.

One clear reason is that a well-chosen book is a wonderful collection 18       words and expressions, so long as you have a good dictionary, of course. Believe me, it’s far easier to get new English words and expressions from a book or article 19        it is from the TV or the Internet.

But an even more important point is 20        books give you something that modern media simply can not: The webpage is always full of pictures and the text is often designed to make it as easy to read as possible.

Though “easy” may be welcome, 21       (luck) it’s of little use for any long-time development of reading skills and the general language level. For that, there’s still no substitute(替代品) for a book.

But perhaps the best single reason is that simply 22       (choose) what you read and doing it by yourself 23        (mean) that it’s something you do by and for yourself. You can choose what you want to read. It’s hard work, 24        while you are reading, you’ll find that what once 25        (seem) like a duty is now a pleasure.

单项选择题