主题：改革是社会发展进步的动力
《走向21世纪的中国和世界》一书指出：20世纪“在世界现代化发展上有着三个重要的改革调整机遇，一是在20世纪初的俄国，一次是在30年代西方大危机时期的美国，还有一次是在70年代末期以来的中国”。
请回答：（1）三次改革调整机遇分别指的什么？其出台的背景共同点是什么？
（2）俄国和美国的改革的突出的特点各是什么？
（3）你怎样评价俄国和美国的改革在其历史发展中的作用？
苏联的办法把农民挖的很苦。他们所采取所谓义务交售制等项办法，把农民的东西拿走太多，给的代价又极低。他们这样的积累资金，使农民的积极性受到极大的损害。***《论十大关系》
（4）结合上述材料，说出材料揭示了苏联经济建设中存在哪一突出问题？
（5）综合以上问题的回答，你认为国家在制定经济政策时应该关注到哪些问题？

按要求改写句子

    Which of your hands do you use most ? Very few of us use both of our hands well. Most of us are right-handed. Only about five people out of a hundred are left-handed. New-born babies can take things with either of their hands, but in about two years they like to use their right hands. Scientists don't know why this happens. They have studied it. They think our animal ancestors(祖先) are right-handed. This may not be true. Monkeys are our closest relations in the animal world. Scientists have found that monkeys like to use one of their hands more than the other—but it can be either hand. There are as many right-handed ones. Next time you visit the zoo, watch the monkeys carefully. You'll see that some of them will swing(摆动)from their right hands and others will use their left hands. But most human beings(人类) use their right hands better and this makes life difficult for the left-handed ones. We live in a right-handed world.

风向是风的____。风向为“北”，表示风来自____。风力是风的____，共分____级。