Crossing roads without taking traffic lights into consideration, ________ they are part of a crowd, has been labeled as the “Chinese style of crossing roads.”

A．since

B．as if

C．though

D．so long as

费德勒认为，在团体情况（）的情况下，任务导向型是有效的领导类型，效果较好。

A.极不利

B.极有利

C.极有利和极不利

D.一般