单项选择题

According to the first paragraph, the atmosphere is essential to man in that（）

A．it protects him against the harmful rays from space
B．it provides sufficient light for plant growth
C．it supplies the heat necessary for human survival
D．it screens off the falling meteors

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单项选择题

While making tremendous achievements at college, Asian-American students （）

A．feel they are mistreated because of limited knowledge of English
B．are afraid that their academic successes bear a strong Asian character
C．still worry about unfair treatment in society
D．generally feel it a shame to have to depend on their parents

单项选择题

According to the passage, what was the percentage of American adults doing regular physical exercises two years ago（）

A．About 70%.
B．Nearly 60%.
C．Almost 50%.
D．More than 12%.