函数f(x)=5+9-x2的最大值是M,最小值是m,则M+m=( ) A.5 B.8

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问题:

函数f(x)=5+
9-x2
的最大值是M,最小值是m,则M+m=(  )
A.5B.8C.13D.40
考点:函数的单调性、最值
题型:选择题

根据首字母,中文或括号里词的适当形式填写单词。只限填Module 6 Unit 2-Unit 5的单词。(共10小题;每小题1分,满分10分)

小题1:This book was a_______ (合适地) written in a style accepted by teenagers, who enjoy reading it.

小题2:I keep getting c_______ (矛盾的) advice — some people tell me to keep it warm and some tell me to put ice on it. 

小题3:To make matters worse, some adolescents are so a_______ to computer games that too much time and energy are wasted.

小题4:The little boy was _______ (embarrass) when his mother, who had a severe scar on her face, attended his first teacher-parent conference.

小题5:Both children have _______ (normal) high levels of infectious virus in their blood.

小题6:To g_______ (确保, 保证) the policy could be effective, the local government took measures to carry out lots of detailed related plans to support the policy.

小题7:E-mail _______ (transform) the way people communicate in the past few years, which makes people feel it convenient to keep in touch with each other.

小题8:You see, during adolescence I also smoked a lot, but after I know smoking damages health, I stopped smoking by _______ (strong) my resolve.

小题9:Some people are in favor of the policy. They think it is reasonable and fair to carry out the policy, because the more the oil _______ (consume) is, the more money the drivers pay, which can avoid the unnecessary driving.

小题10:Joyfully, the elderly _______ (present) with flowers, fruits and presents on that day.

题型:选择题

轮式拖拉机常用的三种转向器形式是()、()。

题型:选择题

—_______? I did not understand what you said.   

—OK! I'll speak more slowly.   [ ]

A. What

B. Excuse me

C. Really

D. Pardon

题型:选择题

某甲的女儿患重病住院,急需用钱又求借无门,某乙趁机表示愿借给2000元,但半年后须加倍偿还,否则以某甲的房子代偿。甲表示同意。根据《合同法》的规定,甲、乙之间的借款合同______。

A.因欺诈而无效

B.因欺诈而可撤销

C.因乘人之危而无效

D.因乘人之危而可撤销

题型:选择题

存储器按信息保存方式分类,可分为挥发性和不挥发性存储器两种,()。

A.RAM是不挥发性只读型存储器

B.RAM是不挥发性随机型存储器

C.RAM是挥发性随机型存储器

D.RAM是挥发性只读型存储器

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