空气污染严重时，应积极补充大量维生素b.e.a，增强身体的抵抗能力，改善体质，从而避免一些呼吸道疾病。()
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The author thinks that Harpers argument in the book is
A. alarming yet exaggerating.
B. disputable yet reasonable.
C. controversial and doubtable.
D. correct and reasonable.
遇到伤人交通事故，救护人员临场后，必须紧急将伤员送往就近的医院。()
We can learn from paragraph 3 that immigrant families
A. do not slow down but speed up American progress.
B. are better off than natives in education and income.
C. are diluting America as a united and coherent society.
D. pose a potential challenge to the American society.
The underlined word "that" in paragraph 5 refers to
A. firing employees.
B. pleasing investors.
C. suffering burnout.
D. mood swings.
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