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Americans depend on their cars more than any other people. The family car has been a common thing since the early 20th century and it 6 American life. Many people have moved outside of the large cities to the 7 . Some Americans spend two hours a day or more in their cars, going to work and back home. Cars have become the 8 of transportation for most Americans when they go shopping and even go on vacations. In the past, Americans liked big cars and the gas wasn"t expensive. However, the price of gas has 9 in recent years. Smaller cars and foreign cars have become very 10 . That"s why Japanese and German cars sell well in the U.S.
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It"s estimated that one-third of the countries of the world are very rich, and two thirds are very poor. People in the richer countries don"t understand the 1 between them and those in the poorer countries. A very simple example is that a dog or a cat in North America is better than a child in the poorer countries. A fisherman in South America may 2 which is made into pet food while the children in poor countries are not getting enough to eat for their bodies to grow 3 . Although a lot of the world"s natural resources come from these poorer countries, it"s the richer countries that decide what kind of price they 4 pay for these resources. And the prices the richer countries get from their 5 , however, are always rising. So they are getting richer and richer, and the poorer countries are getting poorer.
下列选项不属于影响药物制剂稳定性的处方因素是
大气中的氧是引起药物制剂氧化的主要因素，下列防止药物氧化措施表述不正确的是
关于配伍变化的错误表述是
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