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Before 1900, many theories existed as to the cause of yellow fever (黄热病). Some doctors were sure the disease was air-borne; others felt that it was spread from person to person. Dr. Carlos Finlay, a well-known Cuban doctor of that time, had long held the theory that it was caused by the bite of mosquitoes. But neither the public nor the doctors then accepted his idea.

  Walter Reed,all American doctor sent to study yellow fever in Cuba,went to talk with Finlay.Reed,after reading a lot on the subject,had begun to think that Dr.Finlay might be fight.Then Reed and his comrades set to work at once.Outside Havana,they set up a laboratory and began experiments to test the theory.The experiments were successful.Now we know:A period of about two weeks must pass before a mosquito,after feeding on a sick person,could infect(传染) another person.The sick person had to have yellow fever a certain number of days before the mosquito biting him was able to carry the disease.

 

40.Before 1900,many people didn’t think yellow fever was spread_______.

  A.by air

  B.by dirty water

  C.by the bite of certain mosquitoes

  D.by getting in touch with the patient

41.Who first realized the actual cause?

  A.The public.    B.Finlay.    C.Reed.

42.Reed proved the theory_______.

  A.in his American lab

  B.by talking with Finlay

  C.in a kind of scientific Way

  D.by reading a lot of articles

43.One will come down with yellow fever if he has been bitten by_______.

  A.a mosquito

  B.an infected mosquito

  C.a mosquito that has bitten the patient

  D.a mosquito that has bitten the patient for some days

44.What is the possible title for the passage?

  A.Fighting against yellow fever

  B.A doctor against yellow fever

  C.The actual cause of yellow fever

  D.Several theories on yellow fever

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Suppose that we lined up our roughly 14 million United States businesses in order of size, starting with the smallest, along an imaginary road from San Francisco to New York. There will be 4,500 businesses to the mile, or a little less than one per foot. Suppose further that we planted a flag each business. The height of the flag pole represents the yearly volume of sales (销量) , each $ 10, 000 in sales in shown by one foot of pole.
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【小题2】What’s the correct order of the following places from east to west?
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S =" San" Francisco  R =" Reno"  C =" Columbus"  N =" New" York  H =" height"  F = feet

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Suppose that we lined up our roughly 14 million United States businesses in order of size, starting with the smallest, along an imaginary road from San Francisco to New York. There will be 4,500 businesses to the mile, or a little less than one per foot. Suppose further that we planted a flag each business. The height of the flag pole represents the yearly volume of sales (销量) , each $ 10, 000 in sales in shown by one foot of pole.

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1.What is the author’s main purpose in this passage?

A.To tell the reason why the largest firms are in New York.

B.To show the geographical distribution (分布) of the United States businesses.

C.To provide a general idea of the size of businesses in the United States.

D.To tell us how the United States businesses are arranged.

2.What’s the correct order of the following places from east to west?

A.San Francisco, Reno, New York, Columbus.

B.San Francisco, Reno, Columbus, New York.

C.New York, Columbus, Reno, San Francisco

D.New York, Reno, Columbus, San Francisco

3.Among the four parts of the imaginary road , which part , considering all the firms in it , has the largest total volume of sales ?

A.The last 75 miles.                        B.The last 50 miles.

C.The last 100 feet of the last mile.            D.The last quarter of a mile

4.Which of the following diagrams (图表) shows the right order of size of the US businesses , according to the text ?

S =" San" Francisco  R =" Reno"  C =" Columbus"  N =" New" York  H =" height"  F = feet

 

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