双极性电镀时若阳极钝化膜产生过大的电压降，会使电镀的正常进行（）。
A.加快
B.减慢
C.不影响
D.无法判断
参考答案：B
(2013·山东卷)There is no simple answer，________is often the case in science.
A．as
B．that
C．when
D．where
Exercise is ______ as any other to lose unwanted weight.
A．so useful a way
B．as a useful way
C．as useful a way
D．such useful way
