2016年4月湖北自考英語二真題練習：填句補文

湖北2016年4月自考英語二真題練習：填句補文

單選題

[填句補文]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：前一句講的是科學家們過去對二手煙的看法，接下來應選表示他們改變觀點的句子，因為下一句表明他們所持的觀點已與過去截然不同。