阅读理解。 New rules and behavior standards (

题型:阅读理解

问题:

阅读理解。
          New rules and behavior standards (行为规范) for middle school students came out in March. The Middle
School is going to use a new way to decide who the top students are. The best students won't only have high
marks. They should not dye (染) their hair, smoke or drink because they are students. The following are some
of the new rules.
         Have you ever copied someone else's work in an exam? Don't do that again! That's not something an
honest student should do.
         Do more at school. Good students love animals and care for other people. April is Bird-loving Month in
China. Is your school doing anything to celebrate it? You should join! And you can learn more about animals
and how to protect them. Be friendly to the people around you. Try to think of others, not only yourself.  
          Be open to new ideas. Do you think people can live on the moon? Maybe you'll find another earth
someday. Don't look down on new ideas. Everyone's ideas are important. You should welcome them, because
new ideas make life better for everyone.
          Protect yourself. Has someone ever taken money from one of your classmates? Don't let it happen to
you. If you have to go home late, you should let your parents know.
          Use the Internet carefully. The Internet can be very useful for students. But some things on the Internet
aren't for children, so try to look at web pages (网页) that are good for you.
1. What's the meaning of "look down on " in the passage?
[ ]
A. 向下看
B. 轻视
C. 在……上面看
D. 上下打量
2. If you go home late, you should tell your             about it.
[ ]
A. father and mother
B. teachers
C. children
D. classmates
3. Good web pages for children can                 .
[ ]
A. be a waste of time
B. help them with their studies
C. do homework for them
D. make life difficult
4. According to the passage, which of the following is true?
[ ]
A. Tell the truth, even when you are wrong. 
B. Keep some animals to kill them.
C. Look down on new ideas.
D. Everything on the Internet is good for children.
5. The passage mainly (主要地) tells us how to               .
[ ]
A. care for others
B. do more at school
C. be top students
D. use the Internet
考点:科教类阅读
题型:阅读理解

已知集合A={(x,y)|0≤y≤sinx,0≤x≤π},集合B={(x,y)|(x-2)2+(y-2)2≤8},在集合B中任意取一点P,则P∈A的概率是(    )。

题型:阅读理解

在实验室里用乙醇和浓硫酸反应生成乙烯,再用溴与乙烯反应生成1,2-二溴乙烷,可能存在的主要副反应有:乙醇在浓硫酸的存在下在140℃脱水生成乙醚。有关数据列表如下:

 乙醇1,2二溴乙烷乙醚
状态无色液体无色液体无色液体
密度/g·cm-30.792.20.71
沸点/℃78.513234.6
熔点/℃-1309-116
(1)用下列仪器制备1,2-二溴乙烷。如果气体流向为从左到右,则正确的连接顺序是(短接口或橡皮管均已略去):   经A(1)插入A中,  接A(2),A(3)接        (填大写字母代号)。

(2)温度计水银球的正确位置是        

a、支管口处           b、液面上方      c、液面以下

(3)判断该制备反应已经结束的最简单方法是      

(4)将1,2-二溴乙烷粗产品置于分液漏斗中水,振荡后静置,产物应在    层(填“上”、“下”);

(5)若产物中有少量未反应的Br2,最好用   洗涤除去;(填正确选项前的字母)

a、水     b、氢氧化钠溶液   c、碘化钠溶液    d、乙醇

(6)若产物中有少量副产物乙醚,可用     的方法除去;

(7)反应过程中应用冷水冷却装置E,其主要目的是         ;但又不能过度冷却(如用冰水),其原因是            

题型:阅读理解

在图3-2所示的应力一应变曲线中,分别指出(标出对应的纵坐标或横坐标的位置即可):

条件屈服强度(offset yield strength or yield strength)σ0.2

题型:阅读理解

偏瘫患者出现的异常步态不正确的是()。

A.患肢站立相时间明显缩短

B.健侧站立时间延长

C.站立相与迈步相时间的比例下降

D.患侧不能有效地负荷身体的重量

E.患侧摆动相缩短

题型:阅读理解

()UPS中有一个双向变换器,既可以当逆变器使用,又可作为充电器。

A.后备式

B.在线互动式

C.双变换在线式

D.双向变换串并联补偿在线式

更多题库