（）为皮脂膜组成成分。
A.钾、镁、钙
B.镁、钠、钾
C.钠、钾、氯
D.钠、钾、钙
参考答案：C
企业网上银行转账交易的转出方必须是（）
A、基本账户
B、一般账户
C、注册账户
D、非注册账户
He had been________absorbed in watching the car passing by that he didn't notice his friends coming . [ ]
A. such
B. too
C. that
D. so
