如图所示,在的水平面上向右运动的物体,质量为20kg,在运动过程中,还受到一个水

题型:不定项选择

问题:

如图所示,在的水平面上向右运动的物体,质量为20kg,在运动过程中,还受到一个水平向左大小为10N的拉力作用,则物体受到滑动摩擦力为(g = 10N/kg)

[ ]

A.10N,向右

B.10N,向左

C.20N,向右

D.20N,向左

考点:滑动摩擦力、动摩擦因数
题型:不定项选择

下列各类人群中,一段时期内人体摄入和排出的氮量基本相等的是[ ]

A.健康儿童

B.重创伤恢复期病人

C.健康成年男子

D.禁食期病人

题型:不定项选择

2006年,中国单位GDP能耗是巴西的多少倍?

A、2.3 

B、3.3 

C、4.3 

D、5.3

题型:不定项选择

阅读理解。

     He says the problem with teachers is, "What will a kid learn from someone who chose to become a

teacher?" He reminds the other dinner guests that it's true what they say about teachers: Those who can,

do; those who can't, teach.

     I decide to bite my tongue instead of biting his and stop myself from reminding the other dinner guests

that it's also true what they say about lawyers-that they make money from the misfortune of others.

     "I mean, you're a teacher, Taylor'," he says to me. "Be honest. What do you make?"

     I wish he hadn't asked me to be honest, because now I have to teach him a lesson.

     You want to know what I make?

     I make kids work harder than they ever thought they could.

     I can make a C+ feel like a great achievement and an A-feel like a failure.

     How dare you waste my time with anything less than your very best?

     I make parents tremble in fear when I call them:

     I hope I haven't called at a bad time,

     I just wanted to talk to you about something Billy said today.

     Billy said,"Leave the kid alone. I still cry sometimes, don't you?"

     And it was the bravest act I have ever seen.

     I make parents see their children for who they are and what they can be.

     You want to know what I make?

     I make kids wonder.

     I make them question.

     I make them criticize.

     I make them think.

     I make them apologise and mean it.

     I make them write, write, write.

     And then I make them read.

     I teach them to solve math problems that they once thought impossible.

     I make them understand that if you have brains then you follow your heart and if someone ever tries

to judge you by what you make, you teach them a lesson.

     Let me make this simple for you, so you know what I say is true:

     I make a great difference! What about you?

1. What do we know about the man that the author is speaking to?

A. He is respectful to teachers.

B. He is in the author's home.

C. He is actually a lawyer.

D. He dislikes lawyers.

2. The underlined phrase "bite my tongue" in Paragraph 2 is closest in meaning to _____.

A. say something which is wrong

B. speak out honestly but carelessly

C. keep silent about myself

D. stop myself saying what I really think

3. The author called Billy's parents to _____.

A. let them tremble in fear

B. ask why Billy cried that day

C. praise what Billy did that day

D. advise them to leave Billy alone

4. What is the tone of the passage?

A. Angry and proud.

B. Upset and disappointed.

C. Humourous and light-hearted.

D. Cheerful and positive.

5. What's the best title of this passage?

A. An Argument between Two Guests

B. What Teachers Make

C. Requirements of a Good Teacher

D. A Dinner Conversation

题型:不定项选择

研究化学的配伍变化中,不易观察到的情况有()。

A、变色

B、沉淀

C、疗效改变

D、产气

题型:不定项选择

环境保护行政主管部门作出限期治理决定后,负责跟踪检查的工作机构,对排污单位执行限期治理决定的治理进度和排放水污染物状况加强()。

A、前期跟踪

B、后期管理

C、后督察

D、后跟踪

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