每回收1吨废钢铁可炼好钢多少吨?()
A、0.4
B、0.5
C、0.8
D、0.9
参考答案:D
-______ eraser is it on the desk?
-It's John's.[ ]
A. Who
B. What
C. Which
D. Whose
The subjects in our school are ______ those in their school. [ ]
A. the different from
B. the same from
C. the same as
D. the different as