单项选择题
A．He didn’’t like physics any more. B．His eyesight was too poor. C．Physics was too hard for him. D．He had to work to support himself.
A．To protect persons and property. B．To collect taxes. C．To teach and train citizens. D．To save natural resources for future use.
A．She can tell Joan when she sees her at noon. B．She should tell .loan’’s brother about the reception. C．She must call on Joan after the reception. D．She may see Joan’’s brother at lunch.