地球自转产生的现象是（    ）

   Here is a 2-way student exchange. Fred, 19 , spent last year in Germany with George’s family. In turn, George’s son Mike spent a year in Fred’s home in America.
   Fred knew little German when he arrived. But after 2 months of studying, the language became easy for him. School was very different from what he had looked forward to and it was much harder. Students stood up politely when the teacher came into the room. They took 14 subjects while American students usually took 6 in the US.
   Family life, too, was different. The father’s word was the law(法律) . All the children had to do their activities with their family. Fred also missed having a car. In Germany, you should walk to go out to have a good time.
   At the same time, in America, Mike was forming his own ideas. He says,’ American schools are too easy for our level but I have to say that I like it a lot in Germany , we do nothing except study. Here we take part in many other activities.

下列各组括号内除杂的方法或试剂错误的是（ ）

根据短文理解，选择正确答案。

    Whether rich or poor, parents who have books in the home increase the level of education their children will attain, according to a 20-year study led by Mariah Evans.

    For years, educators have thought the strongest predictor of attaining high levels of education was having parents who were highly educated. But, the study showed that the difference between being raised in a bookless home compared to being raised in a home with a 500-book library has as great an effect on the level of education a child will attain as the difference between having parents who are barely literate (有文化的) and having parents who have a university education.

    Being a sociologist, Evans was particularly interested to find that children of lesser-educated parents benefit the most from having books in the home. What kinds of investments should we make to help these kids get ahead? The results of this study indicate that getting some books into their homes is an inexpensive way that we can help these children succeed. Evans said, "Even a little bit goes a long way. Having as few as 20 books in the home still has a significant impact on motivating a child to a higher level of education, and the more books you add, the greater benefit the children get.”

    The researchers were struck by the strong effect having books in the home had on children's educational attainment even above and beyond such factors as education level of the parents, the father's occupation or the economic level of the country.

    Having books in the home is twice as important as the father's education level, and more important than whether a child was brought up in a developing country or a developed country. Surprisingly, the difference in educational attainment for children born in developed country and children born in developing country was just 2 years, less than two-thirds of the effect that having 500 or more books in the home had on children.

阅读下文，回答问题。

跌进坑里．别急着往上爬

小  艾

    那还是孩提时代的事。小学四年级，我们的班主任姓李，是个相貌平平的老头，心肠挺好，教学也很有一套，可就是脾气怪怪的。

    这这天下午有节劳动课。李老师带着我们到学校的后山捡柴，让我们捡地上的枯树枝。

我和三名同学跑向后山顶，边跑边捡。在一棵大树旁，我发现了一堆枯干的小树枝，急忙奔过去。跑着跑着，我脚一滑跌进一个深深的坑里。坑太深，三名同学吓得大呼小叫，想尽办法也没能把我拉上来。

    同学喊来了老师。李老师站在坑边，盯了我许久，才沉着脸坚决地说：“跌进坑里，别急着向上看！我们不拉你上来！”全班同学面面相觑，都没敢吱声。“老师，老师，我上不去！”我在坑里急得大叫。“在里面呆着吧，我们走！”李老师像陌生人一样大声地扔给我一句话，带着同学们走了。

    老师硬生生地走了，不管我的死活。我一屁股瘫坐在坑里，嘴一张，“哇哇”地大哭起来：“老师！老师！我出不去！”一边哭一边生气地在坑里打滚，滚着滚着无意间我看见了一道亮光。擦干眼泪，我坐起来向亮光处爬去。透出亮光的地方有一个洞，我钻了进去，越钻越亮，不一会儿到了山坡上，一挺身我跳了出来。

    李老师和同学们都站在山坡上，随着我的出现，山坡上响起了热烈的掌声，久久不息。老师猛地抱起我原地转了两圈。我所有的不快，一扫而光，不解地问：“老师，你怎么知道坑里有洞能出来？”“老师看你没摔坏。”“老师在上面就看见光了。”“老师想让你自己出来。”没等老师开口，阳光下同学们晃动着聪明的小脑袋争抢着告诉我。

    李老师蹲在我面前，伸出宽大的手掌拍掉我身上的尘土，亲切地抚摸着我的脑袋，重重地点着头。同学们探着身子，咧开小嘴上下打量我。这时，老师慢慢地站起来，环视一下四周，将一只手指竖到嘴边，示意我们安静。然后，他走到高处一字一句地说：“孩子们，记住，跌进坑里，别急着向上看，一心寻求别人的帮助，否则会使人看不见自己脚下最方便的路。”

    三十多年过去了，我还无法忘记儿时跌进坑里自己爬出来的经历，老师的话一直印在我的脑海里。

直到今天，每当生活中遇到失败和意想不到的打击时，我总是这样提醒和勉励自己：跌进坑里，别急着向上看，一心寻求别人的帮助，否则会使人看不见自己脚下最方便的路。（选自2009年第6期《慧语》，有删改）