完形填空

阅读下面短文，从短文后所给各题的四个选项中，选出可以填入空白处的最佳选项。

　　Smoking is a bad habit. And it is very harmful 1 people's health. But many people likesmoking and some of them are addicted (沉溺于) to it. They think it is very 2 to have a cigarette 3 a period of hard work 4 study. So they cannot give up 5 easily.

　　In Europe, smoking was not 6 people before Columbus arrived in the New World in 1492. When Columbus and his 7 arrived, they were greeted 8 the people there. They gave Columbus some dried leaves and 9 him inhale (吸入) the smoke out of the leaves. They smelled sharp and strange. However, soon Columbus and his men took up the habit. They called the 10 “tobacco (烟叶)”。

　　When Columbus 11 Spain, He took back some dried leaves and seeds. Soon the leaves 12 used in cigarette and pipe (烟斗) smoking.

　　When Sir Walter Raleigh, the English explorer, went to the New World, he, too, took tobacco back. 13 is said that he persuaded Queen Elizabeth I to try smoking. But the smoking habit in England did not spread as 14 as that in Spain. Many people felt it was harmful to the body. Still, smoking became very 15 . Tobacco became a big business.

1．

[　　]

2．

[　　]

3．

[　　]

4．

[　　]

5．

[　　]

6．

[　　]

7．

[　　]

8．

[　　]

9．

[　　]

10．

[　　]

11．

[　　]

12．

[　　]

13．

[　　]

14．

[　　]

15．

[　　]