人体试验的道德原则不包括
A．医学目的B．知情同意C．维护受试者利益D．随机对照E．双盲
参考答案：E
___ great the demand to succeed, one should never abandon his moral and social consciousness.
A．Now that
B．As if
C．Although
D．However
最简单的交换排序方法是( )。
A．快速排序
B．选择排序
C．堆排序
D．冒泡排序
