单项选择题
— Mike injured his leg playing football yesterday. — Really?（）
A.Who did that? B.What’s wrong with him? C.How did that happen? D.Why was he so careless?
单项选择题 —（） — He teaches physics at a school.
单项选择题 Students should be encouraged to use（）Internet as（）resource.
单项选择题 One potential danger is（）the information could be used by others to your disadvantage.
