1）. 年近三十,从教十年。

2）. 知识渊博,教学方法科学,上课生动有趣。

3）. 严格、友善、耐心,深受学生欢迎。

4）. 工作努力,受到表彰。

5）. 鼓励大家勤奋学习。在他的帮助下,大家进步很大。

1). 很多人使用皮毛制品，靠猎杀动物挣钱；

2). 为保护动物提出自己的建议；

3). 发出倡议，号召大家一起行动起来保护动物。

注意：

1). 词数100左右；

2). 可适当增加细节，以使行文连贯；

3). 开头和结尾已给出，不计入总词数。

Dear human beings,

    It is known that at present more and more wildlife is being in danger of dying out.

Yours,

Li Hua

1）春节的时间;

2）庆祝春节的方式;

3）春节的习俗。

注意：

1）词数100左右

2）可以适当增加细节，以使行文连贯

China's National Treasure

    Pandas are in danger of extinction at present, with only 1,900 remaining in the world. The scientific name of the giant panda is actually called the cat bear, the number of which is very scarce. It is one of the most precious animals in the world and belongs to the protected animals at the national level. Its body color is black and white. Giant pandas are unique to China, very cute. The existing major habitats are in the surrounding mountainous areas such as Sichuan and Shanxi in China. The giant panda has a very powerful function: digesting bamboo. We all know that bamboo is mainly cellulose (纤维素), and most animals can't digest it except giant pandas. The giant panda's hometown is in the mountains southwest of China, green bamboos and springs everywhere. Therefore, the giant panda's main food consists of bamboo and spring water.

    Giant pandas are often referred to as living fossils. Hundreds of thousands of years ago, it was the peak period of giant pandas. This is of great scientific value for studying and protecting biodiversity and environmental changes on the earth. Long, long ago, the climate of the earth became colder and colder, many ice cubes formed on the earth; plants could not grow, and many animals were frozen or starved to death. The giant panda alone survived in the deep valleys of the mountains and became a treasure of the animal world. The giant panda still retains the characteristics of ancient animals. Therefore, the giant panda is not only popular with adults and children in terms of appearance, but also becomes a living fossil for biologists to study ancient creatures.

    The status of giant pandas has been politicized. Giant pandas can be seen in almost all the major countries in the world. The giant panda has become a witness of friendship between China and foreign countries. For decades, wherever the giant panda goes, a panda whirlwind will blow. With its charmed figure and natural cuteness, the Chinese giant panda attracts numerous fans around the world, and at the same time plays the role of friendship ambassador in China's foreign exchanges, becoming one of the most famous symbols in China.

    It is natural for species of animals to become extinct over millions of years. But over the past 200 years, humans have caused the process to speed up. In recent years, the total number of threatened animal species has increased from 5205 to 5345. In most cases this is a result of human activity. How are people speeding up the process of animal extinction?

    First of all, people threaten the survival of animal species by destroying their habitats. As the human population grows, people keep building houses and factories in fields and woods. As they spread over the land, they destroy animals' homes. If the animals can't find a place to live, they die out. Sixteen kinds of Hawaiian birds have become extinct for this reason.

    Overhunting is another way that humans are causing some animals to become extinct. In some parts of the world, the parts of rare animals are worth a lot of money. For example, some people will pay more than $3,000 for a single rhino horn. This encourages hunters to kill rhinos even though the animal faces extinction.

    Humans are also polluting the air, water and soil. The effect of pollution on animal species can be complicated. For example, when waste from factories is dumped into rivers, the rivers become polluted. The fish that live in the rivers are poisoned, and the birds cannot lay strong eggs. And some, such as brown pelicans, have become rare and may die out.

    Finally, when humans introduce new species into certain environments, the animals that already live there become threatened and face extinction. For example, when European settlers brought rabbits and foxes to Australia, they killed off many native Australian animals, including the bandicoots. Eventually, the rabbits took over the bandicoot habitats. Now bandicoots are threatened with extinction in their own land.

Robotic Exoskeletons

Thanks to robotic exoskeletons, victims of spinal cord (脊髓) injury have a new reason to hope. Robotic exoskeletons, consisting of metal legs, motors, batteries, wiring, a controller and a set of strips work together like the user's bones, muscles and nerves-outside the body. Fastened into an exoskeleton and supported by sticks, users can direct the machinery to take them where they want to go.

In addition to partly restoring mobility, robotic exoskeletons offer the significant mental and physical health benefits of standing up and moving. Just being able to get up from a wheelchair gives patients a more natural, positive view of the world. It also helps relieve pressure on patients' skin and reduces the danger of pressure sores. Standing upright strengthens a disabled person's muscles and bones, improves heart health，and reduces certain other health complications (并发症). And it may actually result in partial nerve repair, something that can only happen when a patient is able to move.

As promising as this technology is, however, it is no simple cure-all for paralysis(瘫痪) or its complications. The motion is not accurate compared with natural walking, and exoskeletons are not easy to use, especially on surfaces that are not smooth. They are very expensive, costing about US$100000. Health insurance plans and government programs may not cover the cost of buying one.

Nevertheless, robotic exoskeletons, and access to them, will continue to improve. As with much modem technology, robotic exoskeletons will likely become more capable and easy to use, even as their cost goes down. Governments and insurers may increasingly see that the health benefits of these walking machines outweigh the costs, making it easier to fund them. Perhaps the day will come when nearly everyone paralyzed by spinal cord injury will be able to "walk" again.