操作方式有几种？
参考答案：
电气操作有就地操作和遥控操作两种
如果把0.28的小数点去掉，原来的小数就（ ）倍。
It is reported that the United States consumes ______ energy as the whole of Africa.
A．as four times
B．four times much
C．four times much as
D．four times as much
