根据材料请回答 31~35
Natural Selection
Natural selection describes the biological process in which the differences of individu-als within a population influence their abilities to survive and reproduce in an environment.The differences in individuals are a result of their genetic inheritance from their parents.In a population, any characteristic which blocks reproduction tends to decrease generation by generation.In time, the ill-adapted die out.On the other hand, the individuals who do survive and reproduce will tend to produce offspring(后代which are better adapted to the environment.Natural selection tends to promote adaptations that will increase the organ- ism's(生物体)ability to survive in an environment.
Natural selection can serve to stabilize a population if the new traits, called mutations (突变), are eliminated when they appear because they are not as well-adapted to the envi-ronment.The opposite effect is' obtained when a new trait is introduced which allows indi-viduals to adapt better over time, the species will change as this mutation becomes more widespread in the population.In human beings, increased brain size helped individuals to adapt better; and so brain size increased gradually in the species.Changes in the overall genetic makeup of a population are normal when there are environmental changes, espe-cially severe environmental disruptions.Specialized adaptations to specific environments can lead, over time, to the development of subpopulation of individuals, who are better a- dapted to particular soil conditions, food sources and so on.Given enough time, these subpopulations may develop into separate species, such as zebras(斑马)and horses, living in distinct environments and not interbreeding.
第 31 题 Individuals in a population differ from one another because__________.
A.they have different success generation by generation
B.they are ill-adapted and eventually die out
C.they have different genetic inheritances
D.they want to survive and reproduce successfully
第1题
关于医院临床信息系统,不正确的是()。
A、医院临床信息系统是医院信息系统的一部分
B、医院临床信息系统与医院信息系统相互独立
C、医学影像系统(PACS)属于医院临床信息系统
D、临床检验系统属于医院临床信息系统
E、病案系统属于医院临床信息系统
第3题
下列不属于临床信息系统的是()
A.护士工作站
B.住院医生工作站
C.实验室信息系统
D.医疗质量管理系统
第5题
A.医学影像信息系统
B.实验室检验信息系统
C.医院管理信息系统
D.临床信息系统
第7题
A.临床信息系统、管理信息系统、区域医疗信息网络
B.管理信息系统、临床信息系统、区域医疗网络
C.区域医疗网络、管理信息系统、临床信息系统
D.CIS、MIS、RHIN
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