答案　D

2．Read the passage and match the main idea of each paragraph.

Para.1　　 A．Offer solutions

Para.2 B．Outbreak of cholera

Para.3 C．Provide two control theories

Para.4 D．Collect information

Para.5 E．Collect results

Para.6 F．Analyse the results

Para.7 G．Find supporting evidence

答案　Para.1　B　Para.2　C　Para.3　D　Para.4　E　Para.5　F　Para.6　G　Para.7　A

Read the passage carefully and choose the best answers.

1．What was the key to help for John Snow's discovery?

A．The government.

B．The woman who had moved away from Broad Street.

C．The water company.

D．The map made by himself.

答案　D

2．At last，"King Cholera" was controlled by .

A．using medicines in hospital

B．driving patients out of the country

C．dealing with the polluted water

D．getting rid of all kinds of pollution

答案　C

3．How many people died per day on average in the two streets where John Snow gathered information?

A．Over 500. B．Over 100.

C．Over 50. D．Over 25.

答案　C

4．What conclusion did John Snow draw according to the evidence?

A．Cholera multiplied in the water.

B．Polluted water carried the virus.

C．A cloud of dangerous gas caused cholera.

D．Cholera could never be controlled even though its cause was found.