What are the speakers most likely to do for the weekend（）

单项选择题The passage is mainly about（）

A. the contradiction between economists and the business community
B. the present debate on economic growth
C. the advantages and disadvantages of economic growth
D. the importance of the debate on economic growth

单项选择题Which of the following is RIGHT for alpha particles（）

A. They are the killers second only to smoking as cause of lung cancer.
B. They can compensate for the abnormal DNA.
C. High dosage and low dosage of them have the same effect on people’s health.
D. They are the number one killer of people’s health.