单项选择题
A. strict B. narrow C. vague D. general
A. are the same kind of birds with different names B. are very different in behavior C. had the same name in the past D. were both used in the experiments
A. So why can’t I have pizza for dinner B. You mean, like a vegetable pizza instead of a cheese pizza C. We’ve had pizza for lunch already. D. I’m not sure.