大学英语四级考试仔细阅读练习试题(12)_大学英语阅读

大学英语四级考试仔细阅读练习试题(12)

　　A) preparing children academically

　　B) developing childrens artistic interests

　　C) tapping childrens potential

　　D) shaping childrens character

　　19. Free play has been introduced in some Japanese kindergartens in order to ________.

　　A) broaden childrens horizon

　　B) cultivate childrens creativity

　　C) lighten childrens study load

　　D) enrich childrens knowledge

　　20. 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 first-rate education.

　　Passage Three

　　Questions 21 to 25 are based on the following passage.

　　Lead deposits, which accumulated in soil and snow during the 1960s and 70s, 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 air-borne leaded gas emissions from 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, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic snow were declining.