应用于药物利用研究的药物流行病学方法有
A．队列研究
B．个例报道
C．随机对照实验
D．群体研究
E．横断面研究
参考答案：D,E
The research results show that the earth goes a little faster ______it is closer to the sun.
A．as though
B．so that
C．than
D．when
