内容提示：   

因为雾霾天气, 学生的户外活动比以前少了;    

人们不得不戴面罩(mask)出行, 道路上也发生了更多交通事故;

空气污染问题严重, 对健康有害; 

每个人都应该采取措施来保护环境。例如……

注意：

短文须包括所有要点, 不必逐句翻译, 要求语句通顺、意思连贯;

第4个要点的内容须适当发挥;

短文开头已给出, 不计入总词数。

    These years the haze weather appears more and more often……

要求：1)应包括上述所有要点，可适当发挥；

2)80 词左右。开头已给出，不计入总词数。（开头已给出，不计入词数）

    Last weekend, I went to the Happy Village with my family.

The Long March 5 Y3 is China's strongest rocket.

    China's biggest and most powerful carrier (运载) rocket roared (轰鸣) into space on Dec 27, 2019. The Long March 5 kicked off its mission (任务) at the Wenchang Space Launch Center in Hainan.

    The 57-meter-tall rocket, known as the Long March 5 Y3, is the tallest, strongest and most technologically sophisticated (技术复杂的) rocket in China. Since it is much bigger than China's other Long March rockets, people call it "Fat 5". The rocket is able to carry spacecraft (航天器) weighing up to 25 tons – roughly the weight of 16 midsize cars – into low-Earth orbit (近地轨道), China Daily reported. This payload capacity (有效载荷) is about 2.5 times greater than that of any other Chinese rocket.

    During the December launch, the Long March 5 successfully sent the Shijian 20 experimental satellite into orbit. At more than 8 tons, it is the heaviest and most advanced communications (通信) satellite built by China.

    The launch also tested key technologies that will be used to take the Chang'e 5 probe (探测器) to the moon, according to the China National Space Administration.

    The success of the Long March 5 launch washard-earned. The rocket's first launch was carried out in November 2016 at the Wenchang center. A second mission took place in July 2017 at the same site, but failed to send a satellite into orbit. According to project leaders, in the two years since that failure, the rocket's research team held more than 600 seminars (研讨会) and carried out at least 1,000 experiments and tests to improve the rocket.

    "Compared with the Long March 5 Y2 that was used in the failed second mission, the new one has about 200 technical improvements, including changes to the engine design," Li Dong, the rocket's chief designer (总设计师), said to China Daily.

    The future missions of the Long March 5 will include a trip to Mars, taking back moon samples (样本), and placing parts of a manned (载人的) space station into orbit. 

Dogs really are man's best friends, and they are very useful in some ways. 

A new study said that dogs can smell(闻) if people are feeling stressed(有压力的). They can smell the difference in breath(呼吸) and sweat(汗液) from people. Then they can tell if people are. stressed or not. It could be 93.75 percent right! A study from scientists at Queen's University Belfast, UK, said this. 

Scientists got breath and sweat from people both before and after doing a hard maths problem. They looked at the people's heart rate(心率), blood pressure(血压) and stress level(压力水平) in the study. The dogs found stress in 675 of the 720 people, that is 93.75 percent of the people, reported Australian news. 

Stress makes people's breath and sweat different. Dogs can smell that difference, said the study's writer Clara Wilson. In the study, she also said this finding helps us know how dogs may know people's feelings. 

Dogs are always man's best friends, and they have special ability(能力), do you think so?

Duan Jiayang, a 13-year-old student of a middle school in Shenzhen, learns the skills required to take care of vegetable fields. "We have many activities, such as placing the mulch film(地膜), "he says, "It's not easy. "

In China, many parents place a heavy focus on their children's good grades, but vocational(职业的) skills have little been cared. "Some parents do everything for their children, "says Yan Mei, an official in the middle school, adding that many students are short of the basic skills needed in their daily lives

Since March last year, the governments have launched(发布)a lot of policies(政策), requiring that colleges, middle schools and primary schools pay more attention to teaching students practical skills. Following these policies, the middle school launched an"agricultural(农业的)class base"on one of its schoolyards. Students plant fruit and vegetables on an area of land about 4, 000m²in size. 

In the days coming up to the MayDay holiday, students of different grades at the school worked together in the fields, says a head teacher of a middle school. They planted watermelons, carrots and corn. 

The school hopes that students will understand the food is quite precious so that they will better realize the difficulties that their parents went through.