When you watch TV and play video games you make global warming(全球变暖) worse! To make electricity, fossil fuels(矿物燃料) are burned in big factories. But burning fossil fuels also makes greenhouse gases. This means that every time you use electricity you help make global warming worse!

    Cars are also making global warming worse. They burn fossil fuels in their engines, and send lots of greenhouse gases into the air.

    So what can we do to stop global warming?

    Try to use less electricity. First, turn off lights, your television, and your computer when you stop using them，You could also try to watch less TV. But you may find it hard to do these! Second, plant trees. Not only is it a fun thing to do, but it is also a great way to lower the number of greenhouse gases in the air. Trees take carbon dioxide(二氧化碳) out of the air when they grow. Last, don't throw away your rubbish, but try to recycle it. Because if rubbish is not recycled, it rots(腐烂) and makes a greenhouse gas called methane(甲烷). So try to recycle cans, bottles, plastic bags and newspapers. It'll make you feel great! And it'll help the Earth.

    Now too much CO makes the Earth warmer and warmer, and brings bad effect to people. To save our Earth, a new lifestyle called low-carbon life becomes popular. Low carbon means low energy and no waste. It is necessary for everybody to learn to live a low-carbon life.

    To live a low-carbon life, we'd better save as much energy as we can. For example, turn off the lights and TV when you don't use them, use cold water to wash clothes or dishes: take a short shower and try to take a cold one when the weather gets warm: don't do the cooking with electricity.

    To live a low-carbon life, we should eat less meat. Being a vegetarian can help reduce (v)one and a half ton of carbon dioxide a year, but keeping animals for food produces even more carbon dioxide than all the cars do in the world.

    To live a low-carbon life, we should plant more trees. Trees are very important for us. They can not only produce oxygen for us to breathe and keep the air clean. But also take in the harmful gases from the air. To protect trees we should stop people from cuing down trees and plant as many trees as we can.

    If we can keep them a habit in our daily life, the earth will become a safer planet for us to live on.

What kind of story is most exciting? What story keeps you reading until the very end? The answer may be the detective (侦探) story.

Detective stories are among the most {#blank#}1{#/blank#}, read and discussed stories in the world. They can be novels, animation (动画) and movies. When we start reading a detective story, we always wish to find out the truth {#blank#}2{#/blank#} we reach the end. But it can be quite difficult to solve the problem as quickly as the detective does. Paying attention to the following elements (元素) may be {#blank#}3{#/blank#} to find the truth.

Motivation—Motive is the reason behind a crime. Does this person have a motive? This is a question always asked by detectives. To answer that, detectives would look into one's personal {#blank#}4{#/blank#} and past experience. People {#blank#}5{#/blank#} a motive can be trusted.

Suspect—Suspects are those who may have done the crime. {#blank#}6{#/blank#} there is more than one suspect in a case. Detectives have to find out the real {#blank#}7{#/blank#} among them.

Clue—Clues are the most important things in finding out the truth. Clues can be very small and hard {#blank#}8{#/blank#}, such as hair, mud or a piece of paper from a diary.

Alibi—An alibi is a special kind of evidence (证据). It means you are not being at the crime scene when the crime took place. For example, if you are having dinner with a friend when the crime happens, your {#blank#}9{#/blank#} words are your alibi. However, an alibi can not always be {#blank#}10{#/blank#}. Your friend may have made up a story to protect you.

Detective stories are like puzzles. Following the elements of motive, suspect, alibi and clue can help us see what the detective see and find out the truth in the end.

写作要点：
1.介绍你自己(姓名、年龄、电话号码等);

2.介绍照片中的家人(姓名、人物关系等);
3. 表达你对家人的爱。

要求：
1.短文应包括所有的写作要点，条理清楚，行文连贯，可适当发挥;
2.短文中不能出现真实的人名和地名；

3.词数不必于 50，短文开头和结尾已给出，不计人总词数。

Hello, everyone!

……

That's all. Thank you.

Hello，boys and girls!My name is Tim. These are four photos of my friends. 

 Do you know anything about the invention of the bar code(条形码)?

A small food store owner found it was 1 to keep records of the product information. In 1948, he asked the Drexel Institute of Technology to solve this 2 . Bernard Silver, a graduate student, was interested. He and his friend Norman Joseph Woodland  3 to work on it. Soon they invented their first working system(系统).

 The system did work 4 , but it was very expensive and sometimes the system didn't work well. If the invention was to become 5 in stores, the problems had to be solved. Finally, Woodland solved 6 .

 The patent(专利权) for the bar code system was 7 for by Silver and Woodland in 1949, but  the patent was not given until 1952. Although this patent was given, the system was still not popular among 8 owners.

 In 1970, a businessman named Logicon Inc 9 the Universal Grocery Products Identification Code(食品工业统一码). Marsh Supemarket in Troy was the first store to 10 this bar code reading system. It has become very popular ever since, and now it's used in all types of stores all over the world.