一个数由十个亿，二百零三个万，五十个一组成，这个数写作______，省略亿后面的

关于先天性髋脱位的检查，下列哪项3岁患儿不宜采用（）

A.弹进弹出试验

B.单足站立试验

C."打气筒"样征

D.屈髋屈膝外展试验

E.Galeazzi征

2012年5月21日，应联合国驻利比里亚特派团要求，中国第十三批赴利比里亚维和工兵大队援建了当地一所因暴雨而坍塌的小学。由此我们可以看出

A．中国支持联合国的一切工作

B．中国为联合国的事业作出了贡献

C．联合国维护世界和平的宗旨

D．联合国在履行 * * 规定的义务

阅读理解

    Do you want to improve the way you study? Do you feel nervous before a test? Many students say

that a lack of concentration is their biggest problem. It seriously affects their ability to study, so do their

test results.

    If so, use these tips to help you.

Study Techniques

    You should always study in the same place. You shouldn't sit in a position that you use for

another purpose. For example, when you sit on a sofa to study, your brain will think it is time to relax.

Don't watch TV while you are studying. Experts warn that your concentration may be reduced by 50

percent if you attempt to study in this way. Always try to have a white wall in front of you, so there is

nothing to distract (make less concentrated) you. Before sitting down to study, gather together all the

equipment you need. Apart from your textbooks, pens, pencils and knives, make sure you have a

dictionary. If your study desk or table is needed when you are not studying, store all your equipment in

a box beside it   .

     Your eyes will become tired if you try to read a text which is on a flat surface. Position your book

at an angle of 30 degrees.

     Be realistic and don't try to complete too much in one study period. Finish one thing before

beginning another. If you need a break, get up and walk around for a few minutes, but try not to

telephone a friend or have something to eat.

Test-taking Skills

     All your hard work will be for nothing if you are too nervous to take your test. Getting plenty of rest

is very important. This means do not study all night before your test! It is a better idea to have a

long-term study plan. Try to make a timetable for your study which lasts for a few months.

     Exercise is a great way to reduce pressure. Doing some form of exercise every day will also improve

your concentration. Eat healthy food too.

     When you arrive in the examination room, find your seat and sit down. Breathe slowly and

deeply. Check the time on the clock during the test, but not too often. Above all, take no notice of

everyone else and give the test paper your undivided attention.

1. Which of the following statements is true according to the passage?

A. You should study in a different place every day, so you don't get bored.

B. Your concentration will improve if you study and watch TV at the same time.

C. Check the time during the exam at a certain time.

D. Staying up all night and studying is tiring, but you will learn a lot using this method.

2. What does the underlined word "it" refers to?

A. Your study desk or table.  

B. Your textbook.

C. Your dictionary.          

D. The equipment you need.

3.  What can be inferred from the passage?

A. You shouldn't look at everyone else during the test.

B. You will have enough energy to deal with your study and exams by eating healthy diet.

C. You'll concentrate more if there is nothing to distract you.

D. If you feel tired during study, you can walk around for a few minutes.

阅读《话说中国画》，回答问题。

本文字里行间蕴含着什么真情？

_________________________________________

（6分）一单色光照到某金属表面时，有光电子从金属表面逸出，下列说法中正确的是（填入正确选项前的字母。选对1个给3分，选对2个给4分，选对3个给6分；每选错1个扣3分，最低得分为0分）。

A．只增大入射光的频率，金属逸出功将减小

B．只延长入射光照射时间，光电子的最大初动能将不变

C．只增大入射光的频率，光电子的最大初动能将增大

D．只增大入射光的频率，光电子逸出所经历的时间将缩短E．只增大入射光的强度，单位时间内逸出的光电子数目将增多