【推荐1】Ask people to name the world's tallest peak and anybody with sound general knowledge will name Mount Qomolangma. But quiz them on its exact __and many will be not sure.

In 1975, Chinese surveyors __ that Mount Qomolangma （Mount Everest） was 8848. 13 meters high. As __ improved, satellites, photoelectricity, radars and gravity measurement technologies were __ to get more exact figures. Of course, someone still had to carry __ to what is the world's rooftop.

In 2005, a Chinese team scaled Qomolangma and found that it was not as high as that, as they __ the height to be 8844. 43 meters. Scaling Qomolangma is no __ task. The average air temperature there is -29 degrees Celsius, even four degrees_____ than in Antarctica. The snow there is 4 —5 meters thick and hurricane-like __ blow all the time. Team members were training to __the extreme conditions.

In a nutshell, measuring the Qomolangma's height is a tall order, __ huge amounts of money and human resources, But it is worth the_____. Qomolangma is the perfect __ for observing crustal （地壳的）movements. And changes to the peak's height could __ whether the two plates are heading toward or away from each other.

Besides, the condition of snow and other natural materials at the top is an indicator of upcoming climate change on the Tibet-Qinghai Plateau. That's __ measuring the Qomolangma's height is so significant. Put to good use, it can benefit mankind.

【推荐2】Ask people to name the world's tallest peak and anybody with general knowledge will say Mount Qomolangma. But quiz them on its exact_________and many will be not sure.

In 1975, Chinese surveyors_________that Mount Qomolangma was 8848.13 meters high. As_________improved, satellites, photoelectricity, radar and gravity measurement technologies were_________to get more exact figures. Of course, someone still had to carry_________to what is the world's rooftop.

In 2005, a Chinese team scaled Qomolangma and found that it was not as high as that, as they_________the height to be 8844.43 meters. Scaling Qomolangma is no_________task. The average air temperature there is - 29 degrees Celsius, even four degrees_________than in Antarctica. The snow there is 4 — 5 meters thick and hurricane-like_________blow all the time. Team members had trained to__________the extreme conditions.

In a nutshell, measuring Qomolangma's height is a tall order,__________a large number of financial and human resources. But it is worth the__________Mount Qomolangma is the perfect__________into crustal (地壳的) movements. And changes of the peak's height could__________whether the two plates are heading toward or away from each other.

Besides, the condition of snow and other natural materials at the top could be an indicator of upcoming climate change on the Tibet-Qinghai Plateau. That's why measuring Qomolangma's height is so__________.Put to good use, it can benefit mankind.

【推荐3】Ask people to name the worlds tallest peak and anybody with general knowledge will name Mount Qomolangma. But quiz them on its exact________and many will be not sure.

In 1975, Chinese surveyors________that Mount Qomolangma was 8848. 13 metres high. As________was improved, satellites, photoelectricity, radar and gravity measurement technologies were________to get more exact figures. Of course, surveyors still had to carry________to what is the world's rooftop.

In 2005 , a Chinese team scaled Qomolangma and found that it was not as high as 8848. 13 metres, as they________the height to be 8844. 43 metres. Scaling Qomolangma is no________task. The average air temperature there is - 29℃ , even four degrees________than that in Antarctica. The snow there is 4—5 metres thick and hurricane-like________blow all the time. Team members are trained to________the extreme j conditions.

In a nutshell, measuring the Qomolangma's height is a difficult task,________huge amounts of money and human resources. But it is worth the________. Qomolangma is the perfect________on observing crustalmovements. And changes of the peak's height can________whether the two plates are heading towards or away from each other.

Besides, the condition of snow and other natural materials at the top is an indicator of upcoming climate change on the Qinghai-Tibet Plateau. That's________measuring the Qomolangma's height is so significant. If it is put to good use, it can benefit mankind.

【推荐1】Have you seen bees at work and stopped to wonder how smart they are? Results of a recent experiment prove that bees are clever enough to _______ time and energy when they fly around to different flowers.

Behavior

Nigel Raine, PhD, from Royal Holloway, University of London, has always been interested in finding out why animals behave as they do. He is also interested in bees. Therefore, it turned out to be not a _______ when he and some other scientists from Queen Mary University of London discovered that bees can quickly solve a problem that _______ computers many days.

A(n) _______ path

Flowers make pollen (花粉), and when bees visit them, they _______ the pollen to other flowers. The plants need the pollen to make seeds that will grow. Raine notes that we get a lot of our food from plants, so it is important to know how the bees move around and take pollen between flowers. The scientists wanted to _______ the journey that the bees take and how they save energy when they do this.

They completed the experiment on the roof of Queen Mary, using _______ flowers and a large amount of nectar (花蜜). They taught one bee to visit all these unreal flowers in one place at the same time. When the bee got to know the location of the flowers well, they saw how it flew around and returned home with the _______ . After this, they changed the locations of the flowers. The scientists thought the bee would follow the route it knew already, which would mean that it followed a longer route than it needed to, and so it would use more energy. They watched the bee carefully as it travelled between the flowers in their _______ location, and they made notes. To their ________ , the bee changed its route and flew a shorter distance.

Travelling salesman

The problem that the bee solved is similar to a math puzzle called the “travelling salesman problem”. A salesman who goes to ________ places to sell things wants to travel the shortest distance to do this. If he is going to visit many different places, it is not easy to ________ which is the shortest route. You have to calculate the length of many possible routes to find out which one is the shortest. A computer can calculate this but the experiment shows bees can do the same ________ quickly with a tiny brain.

Scientists are very interested in how they do this. It would help us to understand how pollen is moved around. ________ , if they find this out, it could help us to improve communication networks. This might help humans to ________ traffic jams when there is an accident, for example.

【推荐2】Even in China, not all people speak in the same way. Have you ever seen an old person from Shanghai and one from Guangzhou who cannot speak Putonghua try to ______ with each other? They each speak a different dialect (方言) which can cause much ______! The Chinese language, as a whole uses the ______ set of characters, but has many dialects which are different in ______. This means that people from different ______ often find it difficult to understand each other. It is the spread of Putonghua throughout China that has made communication between people much ______.

People in northern Europe are much luckier. Even though people from Sweden, Denmark and Norway have ______ own languages, it is very ______ for them to communicate with one another. You might be ______. Do you know why? That is because their languages are quite similar, ______ they can communicate easily in their mother tongues.

【推荐3】One student took a box of chicken to class. Another carried on a cell phone _________ , and still another whistled loudly every time the _________ turned his back. Reform school? No. College.

More and more, professors say, they are coming across _________ students in their classrooms. Many of today’s young scholars(学者) arrive late, leave_________, talk loud or take care of personal _________ such as paying bills during class.

Why are the students behaving badly?

“Because they can,” said a student of University of North Texas. “A lot of the time, the professors let them get _________ with it. ”

Some educators say it is time to bring politeness back to their classrooms—and even _________ taking some of the blame for bad behavior. They say that rude students are by no means the majority but that one of them can ruin an entire _________.

People are _________ when they learn that impolite behavior is becoming more and more common in __________ education, says Dr. Gerald Amanda, a counselor at City College of San Francisco. They __________ some high school students to misbehave but think those who get to __________ will behave more politely.

Dr. Amanda believes that society in __________ has become more tolerant(容忍的) of rude behavior and __________ people in power, including professors, no longer __________ standards for __________. That leads to a growing imprudence(轻率行为) __________ some college students. “There’s a great __________ of bad behavior in the world around them, and young people see it and __________ disrespect,” said Dr. Amanda, __________ that sometimes students have no idea that they are being rude.

【推荐2】Just as we take care of our friends and families, our homes and Mother Earth take care of us. Our homes give us a place of shelter that ________ between us and the rest of the world. The earth is a(n) _________ giver of life and the keeper of our physical and spiritual needs. Her rich ________ bring us up, give us air, and offer us cooling shade. Her waters ________ our thirst. Yet it is easy to take both of these wonderful _________ for granted. ________ the thanks you feel toward your home and Mother Earth for the gifts each   ________   you. It can help you stay   ________ of where many of the gifts in your life come from. Each time you give thanks, you’ll be ________ of the importance of caring for your home and for Mother Earth. There is a simple and beautiful _________ you can find to show your thanks. Begin by finding a ________ place where you can be alone. Sit comfortably and breathe deeply ________ you feel relaxed and then read the following out loud:

“Thank you, home, for allowing me to live ________ your walls. Thank you for allowing me to stay strong and ________ me. Thank you, Mother Earth, for the land I ________ on and farm. Thank you, plants, minerals (矿物质), and animals on the land for allowing me to ________ your beauty and your amazement of life, and for the ________ of living with all of you on this earth. Thank you for the wisdom and       ________ you bring to us.”

You can do so as often as you like and anytime you feel particularly thankful for the many gifts that you have ________. Each time you do this, you’ll strengthen your connection with all that _________ and supports you.

【推荐3】In our modern world, when something wears out, we throw it away and buy a new one. The________is that countries around the world have growing mountains of ________because people are throwing out more rubbish than ever before.

How did we ________ a throwaway society？First of all, it is now easier to________an object than to spend time and money to repair it. ________ modern manufacturing (制造业) and technology, companies are able to produce products quickly and inexpensively. Products are plentiful and________.

Another cause is our ________of disposable (一次性的) products. As________ people, we are always looking for ________ to save time and make our lives easier. Companies ________ thousands of different kinds of disposable products： paper plates, plastic cups, and cameras, to name a few.

Our interest in new products also ________ to the problem. We are________ buying new things. Advertisements persuade us that ________ is better and that we will be happier with the latest products. The result is that we ________ useful things to make room for new ones.

All around the world, we can see the________of this throwaway lifestyle. Mountains of rubbish just keep getting bigger. To________the amount of rubbish and to protect the ________，more governments are requiring people to recycle materials. ________， this is not enough to solve our problem.

Maybe there is another way out. We need to repair our possessions (财产)________throwing them away. We also need to rethink our attitudes about________. Repairing our possessions and changing our spending habits may be the best way to reduce the amount of rubbish and take care of our environment.