下列物质属于混合物的是 A．冰水混合物 B．碱式碳酸铜 C．稀有气体 D．液氧

教学过程中为丰富学生的感性认识就是要贯彻__________原则。

（）属于人寿保险客户服务的特别内容。

A.对承保标的的防灾防损

B.承保服务

C.风险规划与管理

D."孤儿"保单服务

北京的传统民居是：

A．四合院

B．竹楼

C．窑洞

D．土坯房

Researchers have discovered a new poison, bromethalin, that is lethal to all rats, even to those species that have become immune to other poisons, as well as to those rats that eat only the most minute quantities. Tests have demonstrated that rats will not learn to avoid bromethalin and that carcasses of rats killed by bromethalin pose no threat to the well-being of other animals.
Which of the following statements, if true, would support the researchers’ claim that carcasses of rats killed by bromethalin will not pose a threat to other animals

A．Rats that consume bromethalin die immediately.

B．Animals, prompted by curiosity, often examine carcasses that appear in their territory.

C．Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.

D．Traces of bromethalin remain in the rat’s mouth and saliva after the rat eats the poison.

E．(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.

集体主义是社会主义道德的（）和社会主义经济、政治及文化建设的（）。

A.根本要求

B.必然要求

C.基本原则

D.基本思想