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
单项选择题 According to the passage, what was the percentage of American adults doing regular physical exercises two years ago（）
单项选择题 While making tremendous achievements at college, Asian-American students （）
单项选择题 She showed him the photo she （）the day before.
