我爱科学

The planet we live on is called earth. It is special （ 特别的） in the universe（宇宙） because it has life on it. It moves around the sun so we call it a planet（行星）.Our home planet is a rocky one （石质行星）.Our rocky planet has water.Water covers about 70% of its surface（表面）.That＇s why the Earth looks blue from space.     

A Tree Frog on a Rainy Day

In Indonesia（印尼）, a tree frog is holding（抱着）a leaf. Why does it do this？Oh, it＇s raining. It is sheltering（躲避） from the rain!     

光学参量下转换的动力学及其产生的光在演示EPR佯谬中的理论研究

Parametric down-conversion is a useful method to obtain non-classical state in quantum optics. （1） An analytical solution to the Fokker-Planck equation of non-degenerate optical parametric amplification （NOPA） for generation of squeezed light is presented. The maximum intra-cavity compression of squeezed light derived from the analytical solution is 1/16 （vacuum fluctuations 1/4）. To compare it with the previous 1/8 of degenerate optical parametric amplification （DOPA）, it seems that squeezing for NOPA is superior to DOPA.     

The New Life of the Old Newspapers

Look, the squirrel is putting its head into the lens （镜头） of a camera. Is it looking for anything？ What is it thinking？     

A Beautiful Country--Switzerland

it is a fine day today. I go to Switzerland （瑞士） with my family. Switzerland is a beautiful counby in Europe （欧洲）. Look, the sky is so blue. The trees and grass are so green.     

The Spring Festival

The Spring Festival（the Lunar New Year）is one of the most traditional（传统的）Chinese folk（民间的）festivals.Do you know the history of it？Do you know how the Chinese people celebrate（庆祝的）it？Do you know the English expressions（英语表达）about it？     

Apple Maze

The worm （蠕虫） is very hungry now. It sees a big apple and wants to eat it. But it must go through （穿过） the apple maze to get the apple. Can you help the worm？     

山东版《小学英语》五年级下册Unit3：Where did you go ？

1. Hello,boys and girls. I＇m Ms. Sha. I＇m so happy to be your teacher today. First,let＇ s talk about something ! What＇s the weather like today？ What day is it today？ （课件出示三月份日历 ）What day is it tomorrow？ What day is it？     

新鲜事儿

The Goose Beauty Contest Huhgary （匈牙利） There is a goose beauty contest（选美比赛） in Hungary. Is it funny？. Look, the man is showing his goose!     

被盗的自行车

The bike is still locked, but the boy can carry it about 800 meters away. It＇s so strange（奇怪的）. How does the boy do it？ Now let me give you some tips （提示）.     

An Interesting Phrase

A bag is useful and the word ＂bag＂ is useful, too. It reminds us of an interesting phrase（短语）, i.e. ＂to let the cat out of the bag＂. In meaning it is the same as ＂to tell the secret＂. And there is an old interesting story about it.     

让步关系状语从句的几种考查形式

考题示例：1.（ ）the Internet is of greathelp, I don＇t think it＇s a good idea to spendtoo much time on it.（2008湖南卷）A. If ;B. While;C. Because; D. As     

Effective and inexpensive gas chromatography method for detection of trace level SO2 in H2 fuel

Gas chromatography （GC） analysis of sulfer dioxide is challenging because SO2 is a highly mobile and chemically active molecule. For the conventional GC method with flame photometric detector （FPD） and direct-injection, it is often ineffective particularly when the SO2 level is as low as on the trace level. In this paper, a modified GC system integrated with an adsorption-desorption device was developed to detect the trace SO2 impurity in H2 fuel. Adsorbent GDX-502 is used in the adsorber to adsorb/collect SO2 from the sample gas and desorb/release it in a concentrated flow so that the conventional GC at downstream could detect it with an acceptable accuracy.     

Spaghetti Maze

Do you like spaghetti （意大利面）？ Eating spaghetti can be fun, when you pick（挑选） the right one! Which one is it？. Is it A, B, C, D or E？     

单形的径向平均体

In this paper, it is proved that the radial pth mean body RpK（p 〉 0） is homothetic to the difference body DK when K is a simplex, Furthermore, the equality Rp（Rq） = Rq（Rp） is established when p 〉 0 and q 〉 0. It is also proved the Brunn-Minkowski inequality of radial pth mean body of simplex and uniqueness property.     

We have no time to lose !

People often say, ＂Time is money. ＂But I think time is even more important than money. Maybe someone will ask me why. The reason is when money is spent out, we can earn it back. However, when time is spent away, it＇ II never return. One＇s life is limited, so we mustn＇t waste（浪费）time.[第一段]     

My Cat Xiaobai

There is a cat in my family. Its name is Xiaobai.
Xiaobai is polite（礼貌的）.When I go to school,it will say goodbye to me with ＂Meow, meow＂.     

阅读操练

This is the moon, There is no air （空气） or water on the moon. Supergirl and Superdog are very brave（勇敢）. They are flying their spaceship, Now they are on the moon. What are these？ They＇re rocks. What are those？ They＇re mountains, Look! What＇s that？ Oh, it＇s a restaurant. It isn＇t big. A robot is in it. He is a shop-assistant. Supergirl and Superdog want two moonburgers. Supergirl likes the moon. Superdog likes moonburgers.     

How to Make a Magic Stick

Hello, my name is Zheng Yuya. I like drawing and craft（手工） very much. Look, Imade a beaufiful magic sfick（棒）. Do you like it？.     

Reading Comprehension

I.Read and choose （阅读短文做选择题）
A mother and her son are washing dishes while the father and daughter are watching TV in the sitting room. Suddenly （突然） , there is a crash of breaking dishes （碟子敲碎的声音 ） , then it is quiet in the kitchen.