属于两性离子表面活性剂的是（）
A.羟苯乙酯
B.聚山梨酯80
C.苯扎溴铵
D.卵磷脂
E.硬脂酸钙
参考答案：D
—How much are these shorts?
—______ seven dollars. [ ]
A. It's
B. They
C. They're
D. are
（）把“忍”分成六个层次。
A.梁漱溟
B.章太炎
C.梁启超
D.黄念祖
