理想的回收率与实际的回收率是有一定差距的,这里所指的理想回收率应该是()。
A.50%
B.80%
C.90%
D.100%
E.120%
参考答案:D
These shoes look very good. I wonder ____. [ ]
A. how much cost they are
B. how much do they cost
C. how much they cost
D. how much are they cost
喷油提前角过人,过小有什么害处?