次级抵押贷款指一些贷款机构向信用程度较差和收入不高的借款人提供的贷款，是一个高风险、高收益的行业。美国次级抵押贷款市场危机，引起美国股市剧烈动荡，进而导致世界金融危机。美国次级抵押贷款市场危机对商业银行的启示是（  ）

制药时为了在不超过80℃的温度下从溶液中除去水分而提取抗菌素，采用的方法是____（选填“升高”或“降低”）容器内的气压，使水的沸点低于80℃，在不同海拔高度处，大气压强的值通常____（选填“相同”或“不同”）。

    Air pollution(污染) is a big problem. It's bad for all 1 things on Earth，and it is not the only one kind of 2.Water pollution makes fishand pollutes our drinking water. Noise pollution makes us get3more easily.

Many countries are making rules(规定) to fight against pollution. They try to stop people 4 burning coal(煤)in the city and releasing(排放) dirty smoke into the5.And if people use 6fewer cars，the air will get 7.

    8earth is our home. We must protect it and not destroy it. That is to say, we should keep the land, water and air 9.At the same time, we had better plant more trees10they can provide a lot of things for us and make our earth beautiful.