上市后药品临床再评价阶段中，常见病的试验样本数应不少于
A．50例B．100例C．300例D．1000例E．2000例
参考答案：E
. Mary had taken _____ to see that her guests had everything that they could possibly want.
A．efforts
B．pains
C．attempts
D．endeavors
我国的地产市场是土地所有权的出让市场。 ( )
