2014年成人高考专升本每日一练(11月18日)
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单项选择题
1、 偶然性对事物发展的作用是（ ）
A．决定性的支配作用
B．可有可无的作用
C．促进或延缓的作用
D．破坏性的作用
2、 影响苹果果实着色的主要生态因子是（ ）
A．C02
B．养分
C．水分
D．光照
3、 群落的组成单元是（ ）
A．个体
B．各种动物
C．种群
D．各种植物
4、回答题
Thousands of years 21 humans began the process of domesticating the dog and shaping what "being a dog" really means, Through careful selection and breeding, an astonishing variety of dog breeds 22been created．Desirable traits have been selected for in various breeds that are of a benefit23humans．There are some traits, however, that quickly become undesirable when expressed too frequently．Barking is a(an) 24 of a natural behavior that is encouraged in terms of guarding behavior, but becomes a problem when the behavior is produced in excess．A recent health insurance investigation revealed 25the sound of a continually barking dog was cited as the most disruptive and stress inducing 26 for humans．Barking, in addition to whining, howling and growling, is a dog's27means of communication．Barking is characterized by a series of short, sharp sounds, that tend to vary 28in tone or pitch．A dog's bark29signify territorial protection, exertion of dominance, or expression of some need.30 , barking is "a means of communication triggered by a state of excitement．" Being a natural trait, barking is not considered a behavioral problem,31it is produced in excess．The key to solving the problem of excess barking in your dog begins with an understanding of what is causing 32behavior．Once you have determined a cause,33have a greater chance of choosing the most effective solution (e．g．, more exercise) or behavioral modification．Modifying such an instinctive and natural behavior34barking can be difficult, and may require considerable patience, time, and hard work.35 , however, are possible, and worth the effort．
A．since
B．before
C．ago
D．later
5、
A．rural
B．plunge
C．rush
D．rubbish
1、 偶然性对事物发展的作用是（ ）
A．决定性的支配作用
B．可有可无的作用
C．促进或延缓的作用
D．破坏性的作用
2、 影响苹果果实着色的主要生态因子是（ ）
A．C02
B．养分
C．水分
D．光照
3、 群落的组成单元是（ ）
A．个体
B．各种动物
C．种群
D．各种植物
4、回答题
Thousands of years 21 humans began the process of domesticating the dog and shaping what "being a dog" really means, Through careful selection and breeding, an astonishing variety of dog breeds 22been created．Desirable traits have been selected for in various breeds that are of a benefit23humans．There are some traits, however, that quickly become undesirable when expressed too frequently．Barking is a(an) 24 of a natural behavior that is encouraged in terms of guarding behavior, but becomes a problem when the behavior is produced in excess．A recent health insurance investigation revealed 25the sound of a continually barking dog was cited as the most disruptive and stress inducing 26 for humans．Barking, in addition to whining, howling and growling, is a dog's27means of communication．Barking is characterized by a series of short, sharp sounds, that tend to vary 28in tone or pitch．A dog's bark29signify territorial protection, exertion of dominance, or expression of some need.30 , barking is "a means of communication triggered by a state of excitement．" Being a natural trait, barking is not considered a behavioral problem,31it is produced in excess．The key to solving the problem of excess barking in your dog begins with an understanding of what is causing 32behavior．Once you have determined a cause,33have a greater chance of choosing the most effective solution (e．g．, more exercise) or behavioral modification．Modifying such an instinctive and natural behavior34barking can be difficult, and may require considerable patience, time, and hard work.35 , however, are possible, and worth the effort．
A．since
B．before
C．ago
D．later
5、
A．rural
B．plunge
C．rush
D．rubbish
6、
设函数ƒ(x-1)=x2+e-x，则ƒˊ(x)等于（ ）．
A．2x-ex
B．
C．
D．
7、
下列合同中不属于承揽合同的是（ ）。
A．加工合同
B．定作合同
C．修理合同
D．买卖合同
填空题
8、
已知P(A)=0.8，P(B\A)=0.5，则P(AB)=__________.
简答题
9、(本题满分10分)已知袋中装有8个球，其中5个白球，3个黄球．一次取3个球，以X表示所取的3个球中黄球的个数．
(1)求随机变量X的分布列；
(2)求数学期望E(X)．
10、根据信息保持时间的长短分类有哪些？
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