依据《中华人民共和国水法》，围湖造地是被（）的行为。
A、限制
B、适度允许
C、鼓励
D、禁止
参考答案：D
On AIDS Day, the minister of Health Department demanded that the problems _____ paid special attention to.
A．referred to being
B．referred to be
C．refer to being
D．refer to be
请简述“分层法”的基本假定是什么？
