48.Before 1900, many people didn’t think yellow fever was spread ______.
A. by air
B. by getting in touch with the patient
C. by the bite of mosquitoes
D. by dirty water
49. What is true according to the passage?
A. Reed agreed with Finlay after his talk with him.
B. Reed proved the theory by reading a lot of articles.
C. Reed proved the theory in his American lab.
D. Reed scientifically proved the theory.
50. Who first realized the actual cause?
A. the public
B. Reed
C. Finlay
D. doctors
第二节七选五(共5小题,每小题2分,满分10)
There is an English saying:___51___ Until recently, few people took the saying seriously. Now, however, doctors have to begin to look into laughter and effects it has on the human body. ___52____
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physics exercise. ____53____If laughter exercises body, it must be beneficial.
Other tests have shown that laughter appear to be able to reduce the effect of pain on the body. In one experiment , doctors produced pain in groups of students who listened to different radio programs. The group that tolerated(忍耐)the pain for the longest time was the group which listened to a funny program.
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