题目

-- What was Jim wearing at the party?       -- Nothing ____. He was in his usual shirt and jeans.     A.special         B.simple          C.important        D.interesting 答案：A 对于两条直线a，b和平面α，若b?α，则a∥b是a∥α的 [　　] A．充分但不必要条件 B．必要但不充分条件 C．充要条件 D．既不充分又不必要条件