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　　1、單選題

　　[填句補(bǔ)文]The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past， scientists did not think that these chemicals could harm a nonsmoker‘s health. ________. They discovered that even nonsmokers had unhealthy amounts of these toxic (有毒的) chemicals in their bodies.

　　A、The Gilsons have been married for 35 years.

　　B、Recently， though， scientists changed their opinion after they studied a large group of nonsmokers.

　　C、We cannot avoid secondhand smoke in restaurants.

　　D、In the United States， nine million children under the age of five live in homes with at least one smoker.

　　正確答案：B

　　答案解析：前一句講的是科學(xué)家們過去對二手煙的看法，接下來應(yīng)選表示他們改變觀點(diǎn)的句子，因?yàn)橄乱痪浔砻魉麄兯�持的觀點(diǎn)已與過去截然不同。

　　2、

　　單選題

　　[填句補(bǔ)文]David Guterson and his wife teach their three children at home. Guterson says that his children learn very differently from children in school： ________. For example， when there is heavy snowfall on a winter day， it may start a discussion or reading about climate， snow removal equipment， Alaska， polar bears (北極熊)， and winter tourism. A spring evening when the family is out watching the stars is a good time to ask questions about satellites and the space program.

　　A、Some parents prefer teaching their children at home because they do not believe that public schools teach the correct religious values.

　　B、Learning starts with the children‘s interests and questions.

　　C、Interestingly， results show that home-schooled children quite often do better than average on national tests in reading and math.

　　D、Critics also say that most parents are not well qualified to teach their children.

　　正確答案：B

　　答案解析：此空要填的是home-schoolers與其他孩子學(xué)習(xí)的不同點(diǎn)，因此選B。

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