笼型电动机和同步电动机选择起动方式时，如条件允许优先采用的起动方式为( )。

A．转子串频敏变阻器起动
B．星—三角起动
C．全压起动

D．变频起动

The WTO cannot live up to its name（）it does not include a country that is home to one fifth of mankind.

A.as long as

B.while

C.if 

D.even though