某县卫生局对本年度疾病的死亡情况进行分析总结，并希望提出各种疾病在总死亡中的排列顺位

Man has a big brain. He can think, learn and speak. Scientists used to think that man are different from animals because they can think and learn. They know now that animals--dogs, rats and birds--can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or hungry. or unhappy. Apes are our nearest cousins. They can understand some things mole quickly than human beings, and one or two have learned a few words. But they are still different from us. They cannot join words and make sentences. They cannot think like us because they have no language. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child can. speak his own language vet well when he is four or five--but no animal learns to speak. How do children learn Scientists do not really know. What happens when we speak Scientists do not know. They only know that man can speak because he has a big brain.

Now, scientists still don’t really know （）

A．whether animals can think about the past and the future

B．how children learn and what happens when we speak

C．at what age, a child can speak his language very well

D．what animal can understand some things more quickly than human beings

住宅房屋的排水管道可分（）。

A、生活污水管道

B、生产污水管道

C、雨水管道

下列哪种情形下不得录取为公务员？（）

A.刘某，因严重违反单位纪律被开除公职

B.王某，党员，因个人作风问题被留党察看

C.李某，曾因盗窃罪被判处管制3个月，现管制期限已届满

D.方某，名牌大学研究生，但受西方腐朽思想的侵蚀，对社会主义制度颇为不满

患者王某，女，32岁，在得知自己被确诊为乳腺癌早期时，忍不住躺在病床上失声痛哭。这时护士小高轻轻走近王某，在她的床边坐下，默默递给她一张面巾纸，并轻轻地拍拍她的肩膀。

小王的行为属于（）

A.动态体语

B.仪表形象语

C.同类语言

D.时空语言

E.反馈语言

截止阀和升降式止回阀，介质流动方向一般由阀瓣（）向（）流动。