枸橼酸铋钾服后可能导致（）
A．黑色大便
B．口干和视力模糊
C．便秘
D．幻觉、定向力障碍
E．疲乏、嗜睡
参考答案：A
He asked me ______.
A．whether was I a football player
B．was I a football player
C．that whether I was a football player
D．whether I was a football player
试述资金成本的作用。
