问题 选择题

完全沉淀等物质的量浓度的NaCl、CaCl2和AlCl3三种溶液中的Cl,消耗等物质的量浓度的AgNO3溶液的体积比为3:2:1,则三种氯化物溶液的体积之比为(   )

A.1∶1∶1

B.3∶2∶1

C.6∶3∶2

D.9∶3∶1

答案

答案:D

正确答案:D

三种氯化物溶液的体积之比==9∶3∶1

不定项选择
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        After moving to the United States, immigrant groups trying to fit in tend to choose high calorie fatty

foods in an attempt to appear more American,a new study finds.That's one reason why immigrants

approach US levels of obesity within 15 years of moving to America.    

        The researchers also did an experiment that measured whether or not the threat of appearing

un-American influenced respondents' food choices.After being questioned about their ability to speak

English,75 percent of Asian-Americans identified a typical American food as their favorite. Only 25

percent of Asian-Americans who had not been asked if they spoke English did the same.    

        When their American identity was called into question during a follow-up study, Asian-American

participants also tended to choose typical American dishes,such as hamburgers and cheese

sandwiches.In that experiment, 55 Asian-Americans were asked to choose a meal from a local Asian or

American restaurant. Some participants were told that only Americans could participate in the study.

Those who chose the more typical American fare ended up consuming an extra 182 calories,including 12

grams of fat and 7 grams of saturated fat(饱和脂肪).

        "People who feel like they need to prove they belong to a culture will change their habits in an

attempt to fit in,"said Sauna Cheryan,an author of the study and assistant professor of psychology at

the University of Washington." If immigrants and their children choose unhealthy American foods over

healthier traditional foods across their lives,this process of fitting in could lead to poorer health." Cheryan

added.    

        Social pressures,the study concluded, are at the heart of the problem."In American society today,

being American is associated with being white.Americans,who don't fit this image even if they were

born here and speak English,feel that pressure to prove that they're American," said Cheryan.

1. The author wants to show that __________.    

A. more and more Asians enjoy high-calorie snacks     

B. immigrants tend to eat American junk food to fit in    

C. most Americans are at the risk of heart disease    

D. all the American people have a bad eating habit

2. According to the survey, __________.    

A. Asian-Americans care less about their health    

B. 25 percent of Americans like junk food  

C. choosing food is related to Asian-Americans' situation    

D. immigrants are forced to eat junk food

3. The underlined word "fare" in Paragraph 4 most probably means" __________".    

A. food offered as a meal    

B. a person taking a taxi    

C. money spent on food           

D. an arranged thing to do

4. According to Sauna Cheryan, __________.

A. what immigrants have done is ridiculous  

B. American traditional foods are healthier    

C. immigrants risk their health in order to fit in     

D. American culture affects immigrants deeply

5. Which of the following should take the blame for the bad eating habit?

A. The situation of employment.

B. The traditional culture.

C. The American government.        

D. The pressures from society.