C.They are pretty and gentle.         

D.They frequently attack babies.

9.According to the passage,which of the following statements is true?

A.The number of rats is decreasing quickly.

B.Rats usually go for your throat at night.

C.Rats will disappear at last because they carry disease.

D.Rats will survive because they can live anywhere.

10.By which of the following could the “ exaggerated"(sentence 5,paragraph 2) be best replaced?

A.smaller than it really is.                    B.kept in secret.

C.larger than it really is.                         D.the same as it is reported.

Passage 3

    For years,the Tobacco Institute has tried unsuccessfully to refute the charge by health experts that cigarette smoking can be dangerous to your health.Now the institute has taken a new tack.In an advertising campaign last fall,the industry trade association paid no attention to health questions and emphasized that no smoking could be dangerous to local economy. “ Tobacco means $1,193,000,000 to Virginia,"said one advertisement, “ Virginia tobacco helps pave Virginia roads,build Virginia parks and support Virginia social programs.Tobacco means 90,000 Virginia jobs." The message was repeated with an appropriate dollar figures in six other tobacco states.

    The statistics are based on a study by the University of Pennsylvania's Wharton School,which calculates that,overall,the U.S.tobacco industry generates $30 billion in tax revenue( 税收 ) each year.\!If you look at the economic contribution tobacco makes to America," says Edward Horrigan,Jr.,Chairman of R.J.Reynolds Tobacco Co., “ there's no reason for us to be ashamed of the business we are in. ”

    The American Cancer Society disagrees.While Virginia is collecting its $1.2 billion in tobacco revenue this year,the Society said,2,900 of its citizens will be victims of lung cancer.Thousands more,the Society could add,will be victims of other diseases strongly associated with smoking.And the U.S. Surgeon General estimates the direct dollar coats of treating smokingrelated illnesses nationally at more than $13 billion a year — not to mention another $25 billion in lost wages and productivity.

11.On what ground did the Tobacco Institute dispute with health experts?

A.The Tobacco Institute was unwilling to pay more tax.

B.The Tobacco Institute argued that much of the government's revenue comes from tobacco tax.

C.The Tobacco Institute argued that cigarette smoking can be dangerous to your health.