原油的蜡、胶质和沥青的含量组成是影响（）的因素。
A、自喷
B、出砂
C、抽油
D、结蜡
参考答案：D
It is illegal for a public official to ask people for gifts or money ________ favors to them. [ ]
A．in preference to
B．in place of
C．in agreement with
D．in exchange for
眶上裂综合征可出现
A．上睑下垂
B．瞳孔缩小
C．眼球后退
D．眼球运动障碍
