单项选择题
A. Because he was of ill health. B. Because he was in a bad mood. C. Because his wife abandoned him. D. Because his immune system was not strong enough.
A. Both multi-national and small local companies. B. Listed companies. C. Smaller local companies. D. International enterprise.
A. Stop thinking about the matter. B. Talk the drug user out of the habit. C. Be more friendly to his schoolmate. D. Keep his distance from drug addicts.