题目

已知向量a＝(2，－1,3)，b＝(－1,4，－2)，c＝(7,5，λ)，若a，b，c三个向量共面，则实数λ等于( ) A.         B.       C.         D. 答案：D — I like the new teacher. — Me, too. Yesterday she gave me ____ on studying Chinese. [     ]A. some advices B. an advice C. many advices D. some advice