【文章內(nèi)容簡介】 ally being admitted to toprated schools and universities. Several more progressive programs have introduced free play as a way out for the heavyintellectualizing in some Japanese kindergartens.16. We learn from the first paragraph that many Americans believe A) Japanese parents are more involved in preschool education than American parentsB) Japan39。s economic success is a result of its scientific achievementsC) Japanese preschool education emphasizes academic instructionD)Japan39。s higher education is superior to theirs17. Most Americans surveyed believe that preschools should also attach importance to A) problem solvingB) group experiencebelieve that preschools should also attach importance toC) parental guidanceD) individuallyoriented development18. In Japan39。s preschool education, the focus is on A) preparing children academicallyB) developing children39。s artistic interestsC) tapping children39。s potentialD) shaping children39。s character19. Free play has been introduced in some Japanese kindergartens in order to A) broaden children39。s horizonB) cultivate children39。s creativityC) lighten children39。s study loadD) enrich children39。s knowledge20. Why do some Japanese parents send their children to university:based kindergartens?A) They can do better in their future studies.B) They can accumulate more group experience there.C) They can be individually oriented when they grow up.D) They can have better chances of getting a firstrate education.Passage Three Questions 21 to 25 are based on the following passage. Lead deposits, which accumulated in soil and snow during the 196039。s and 7039。s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly. A study published recently in the journal Nature shows that airborne leaded gas emissionsfrom the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, anexpert on the impact of heavy metals on the environment at the National Center for ScientificResearch in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic(北極的 ) snow were declining. In his new study, Dr. Boutron found the ratios of the different forms of lead in the leadedgasoline used in the United States were different from the ratios of European, Asian and Canadiangasolines and thus enabled scientists to differentiate ( 分區(qū)) the lead sources. The dominant leadratio found in Greenland snow matched that found in gasoline from the United States. In a study published in the journal Ambio, scientists found that lead levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline. Many scientists had believed that the lead would stay in soil and snow for a longer period. The authors of the Ambio study examined samples of the upper layers of soil taken from thesame sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990.The forest environment processed and redistributed the lead faster than the scientists had expected. Scientists say both studies demonstrate that certain parts of the ecosystem (生態(tài)系統(tǒng) ) respond rapidly to reductions in atmospheric pollution, but that these findings should not be used asa license to pollute.21. The study published in the journal Nature indicates that A) the Clean Air Act has not produced the desired resultsB) lead deposits in arctic snow are on the increaseC) lead will stay in soil and snow longer than expectedD) the US is the major source of lead pollution in arctic snow22. Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US A) was discouragedB) was enforced by lawC) was prohibited by lawD) was introduced23. How did scientists discover the source of lead pollution in Greenland?A) By analyzing the data published in journals like Nature and Ambio.B) By observing the lead accumulations in different parts of the arctic area.C) By studying the chemical elements of soil and snow in Northeastern America.D) By paring the chemical positions of leaded gasoline used in various countries.24. The authors of the Ambio study have found that