材料一  1861年改革为俄国的工业发展提供了大量的劳动力和广阔的市场，就像列夫·托尔斯泰在长篇小说《复活》的开篇所写的那样：“一切都翻了个个儿，一切却又刚刚开始。”

材料二 美国在19世纪已经具有世界经济大国的实力……第二次世界大战使美国成为当之无愧的世界霸主……——摘自美保罗·肯尼迪《大国的兴衰》

材料三 在二十世纪二三十年代，苏俄和美国都先后面临严重的经济、政治危机。他们为了抗衡危机、挽救国家现有的政治制度、维护社会的稳定，在经济、社会领域进行了卓有成效的改革。

材料四  20世纪90年代，当苏联政局发生巨变的时候，美国进入了新经济时代。

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如图是小明用量筒、小玻璃杯和水测量某工艺品密度的示意图．小明读出空玻璃杯漂浮在水面上时水面的示数是____mL，工艺品的质量是 ____g，体积为 ____cm³，密度为　 ____kg/m³

   What does it feel like to break a bone (骨头)? It’s different for everyone, but the pain is often sharp (严重). If the break is small, however, the person may not feel much pain at all. If you think that you or someone else has broken a bone, the most important things to do are to stay calm, make the hurt person comfortable, and call the doctor. Do not move the injured body part since movement could make it worse.
To treat the break, the doctor will need to take an X-ray. This gives the doctor the information he or she needs to set (接上) the bone: to put it back to its normal place. If the bone is large or it is broken in more than one place, the doctor may need to use metal pins (钢钉) to set it. After the bone has been set, the next step is usually putting on a cast, the special, hard thing that will keep the bone in place for a month or two.
   ypur bones are excellent at healing themselves. Broken bones will produce many new cells (细胞) and tiny blood vessels (血脉). These cover both ends of the broken part, and close up the break until the bone is as whole and strong as before.

保护生物圈应从我做起，下列做法不合理的是（ ）

阅读短文，下列问题

Computers are very important for the students now. For the city students, it's very easy to find a place to surf the Internet(网上冲浪). And for the village students, they can go to the Internet bar(网吧). Most of them spend more than two hours there, and some of them even spend more than eight hours there every day. They can do their homework, download(下载) some information for their homework, download music, send emails and play games.Most of them spend too much time playing games, so it's bad for their study.