题目内容
5.听第10段材料,回答第18至20题.18.What is the aim of the research in the United States?
A.To prevent people from going to public toilets.
B.To observe how people behave in the public places.
C.To see how the good advice to wash hands is followed.
19.What does the study show?
A.Not many people use public toilets.
B.Most people are not afraid of getting sick.
C.People don't seem to wash their hands so often as they say.
20.How many people in the USA were observed(观察) in the program?
A.1,000.B.8,000 C.9,000.
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