Now many people like to keep dogs as their pets. But how did dogs become humans' close friends?

    In some places of Europe (欧洲), about 10,000 years ago, some wild (野生的) dogs often came to human's houses to find food. The wild dogs looked different from the ones today. They looked like wolves (狼). At first, they felt ① frightened. They always stood and looked for a short time. Then they got the food and ran away. Sometimes the young dogs couldn't run fast and people caught them. People trained them and the young dogs grew up with the help of people. Slowly, the wild dogs became home dogs. They could make home safe when people were away. They helped people hunt (狩猎). They helped people keep warm on cold nights. ② Sometimes, they could smell and hear danger before people could. In some cold places, they helped people pull (拉) things people need.

    Now there are more than 400 different kinds of dogs in the world. And they look different from each other. The number and kind are growing all the time. Today, some people mainly (主要地) regard dogs as pets. In fact, dogs are really our close friends. We should protect them from being killed.

阅读下面短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词，每个空格只填1个单词.

    Summer schools Summer vacation means long days, sleeping in or enjoying the summer sun. It is quite true for students to enjoy a rest after a long and difficult year. But more and more parents fear their kids forgetting a lot of knowledge, so they send their children to summer schools. Because summer schools can help children go over the knowledge that they have learnt during the school year.

    In summer schools, students probably study in a more relaxing situation and can come up with interesting topics for discussion with their teachers. Usually, the number of students attending summer schools is smaller, so this gives them a good chance to connect with other students and teachers better. If a student has failed a course, summer schools may help him or her. Moreover, they are building their creativity （创造力）and imagination（想象力）as well as learning social skills.

    On the other hand, summer schools bring children problems at the same time. It takes children the whole summer vacation to learn without playing. That is too long. As a result, it may make them less interested in school during the coming year.

    For many students, taking summer classes can be a tiring experience. Teachers teach the subjects too quickly, which only harms the whole education of students. Summer schools are usually expensive. They usually offer only a few subject. So many students have to take classes that they don't like.

    A summer school can be a good chance for students who need it, but it can be difficult for students who need a rest. So you can decide whether a summer school is suitable for your children.

    Each and every year, during Chongyang Festival, citizens of China celebrate the elders in their families and communities. It's a special tradition which is rooted in the deep value that Chinese culture places on honouring their elders.

Sadly, many of our aging population are seniors without sons, daughters or grandchildren to visit. While they may have great friends, they no doubt miss the tender and loving relationships unique to families. To fill this void（空虚）, many volunteers turned up on October 28 at nursing homes around the country in order to spend time with the residents. In some cases, they performed humble（谦逊的） gestures of kindness, such as combing their hair or washing their feet.

    While the kind acts were appreciated, one embarrassing story out of Anhui province raised a valuable question. Reportedly, one old gentleman had his feet washed seven times during the day by different volunteers. Is this genuinely（真诚地） caring for the elderly? Many of the residents at the home said that those gestures do not make them feel cared for at all. Their family members or community volunteers may drop by for a few hours of token time, but soon they disappear back into their busy lives.

    There is nothing we can give that is more valuable or appreciated than our time. While you may feel like there is barely enough time to care for your many responsibilities, might it be possible to spare just a moment as you walk home from school to sit with a senior who lives in your community? Just five minutes is not going to prevent you from getting your homework done, but it may totally change a day of loneliness into a day of joy for one old man or woman. Do you live far from your grandparents? Why not pick up the phone and let them know you're thinking of them? Or maybe you could remind them of the “good old days” and mail them a short letter. Imagine their surprise and joy!

We live in a complicated（复杂的） and busy world, but kindness and caring is still a very simple thing.

    Do you keep a diary（日记） every day? Do you think it is great to remember just what you did on a day many years ago? One way to remember each day is to write about it in a diary. Many people write their diaries every day. They write about what they did, what they ate, whom they saw and met, how they did something and how they felt during that day.

    Most people do not want anyone else to read their diaries. They keep them in a safe （安全的）place. Some Chinese students try to keep diaries in English not only to help themselves to remember something, but also to practice English.

    Long ago, many people wrote diaries, too. People have found some of those old diaries.  Some diaries are useful because we can learn about the life long ago, or we can get to know something important or something interesting.

    There are many famous diaries in the world. Most people in China have read the Diaries of Lei Feng. Lei Feng was a soldier（战士）.In his short life, he did a lot of good things for others and for his country. He was always ready to give, but never asked for anything from people. He kept diaries and from them, people learn what a great man he was. In China's schools,  students learn some of his diaries as texts（课文）.

根据短文内容回答问题：

    With air pollution making much difference to many of Chinese cities, parents are calling for the installation(安装) of air cleaners in classrooms. There has been much debate over whether air cleaners should be used in China's schools. Some parents have donated cleaners to their children's classrooms, while others raise money together to make the purchase(购买). “Our school bought air cleaners last year. We did a little fund raising, with each parent throwing in several hundred for that,” said one parent.

    However, the idea of installing air cleaners for all the classes has been refused by some schools. Liu Liangcheng, vice-principal of Beijing's Taipinglu Primary School, says installing air cleaners bought by parents may lead to problems. “We have refused air cleaners bought by parents before, as there are clear and strict rules against educational fees. We can't just break the rules here. And without standard guidance (指示) from local authorities(权威部门), it is hard to decide on the brand of the cleaner, installation and even safety of the device(设备).”

    Moreover, experts say air cleaners can cause other health problems. Deng Gaofeng who works for the China Academy of Building Research says. “ In the classroom, if we keep windows and doors closed, the concentrations (浓度) of CO₂ will double from 1,000 PPM to some 2,000 PPM. According to national safety standards, the highest level should not be more than 1,500.” In addition, experts say air cleaners on the market are mostly designed for homes or offices. Evaluation(评估) is needed to know whether they are suitable in classrooms.

    It seems whether air cleaners should enter China's schools is an ongoing question. It still requires a more detailed plan.

阅读以上信息，用恰当的单词完成下面的表格，每空一词。

Topic : Should air cleaners be installed for students in school?

    It's the end of class. When the bell rings, students of a Foreign Languages School in Shenzhen quickly take out their mobile phones. They like to log on (登录) to their micro blogs to check the funny things that have happened in the last hour.

    Micro blogging has swept the country during the last few years. Recent surveys show that most students in middle schools have a micro blog, and some even update their blogs more than five times a day.

    "We learn many fresh and interesting things on micro blogs and they have become popular topics in class," said Liang Jianmin, 14, a student from Harbin No. 3 Middle School. "If you do not know about them, you are out.”

    It is also a great place for students to relax." My parents always ask me to study hard, and encourage me before exams, but actually it adds pressure," said Zhang Yazhe, 15, a student from a Foreign Languages School. "When I share these feelings on my micro blog, I get many replies from friends in the same situation, which makes me feel better."

    But parents are worried that micro blogging could be a waste of time. Some misleading messages may even be dangerous to kids.

    Shen Mingde, a professor, suggests parents not worry too much that kids are crazy about micro blogging. Instead， however, it can also become a window for parents to understand their children. "If parents can read their children's micro blogs, they'll know their thoughts, it can lead to better communication and solutions to problems," he said.

    He also gives some advice to kids.

    Don't micro blog for more than one hour a day.

    Never micro blog in class.

    Try to talk face to face with people from time to time.

    Be critical(批判性的). Not all the messages on the micro blog are true.