【推荐1】In China, the history of people planting and using bamboo can date back as far as 7000 years. As early as the Shang Dynasty, bamboo was being used in ancient people's daily lives. It was used for food, clothing, housing, transportation,    1     (music) instruments and even weapons.

The     2     (apply) of bamboo in science and technology is thrilling. In 251 BC, Li Bing, in Sichuan,    3     (lead) the local people in building the Dujiang Weirs, the first irrigation network in the world, in which bamboo played     4     important role. The world’s oldest water piper was also     5     (make) of bamboo. During the Han Dynasty, the people in Sichuan     6     (success) sank a 1600-metre-deep well with thick bamboo ropes. This technology did not spread to Europe     7     the 19th century, and it was by using the technology     8     the Americans drilled the first oil well in Pennsylvania in 1859.

In Chinese culture, bamboo is well-known as     9     of the “four gentlemen” in plants. To many distinguished men，bamboo is a symbol of goodness and honesty. It is always closely related to people of positive spirits. Bamboo culture contributes to encouraging People to hold on when     10     (face) tough situations.

Polar bears are undergoing hunger in a world     1     (warm) than ever before.

Polar bears live in the environment too cold for most animals. For most of the year, they live and hunt on Arctic sea ice. Nature has prepared     2     (they) for the cold conditions. But nothing has prepared the bears for the danger     3     threatens their only home.

Polar bears’ world is melting. Studies show that polar ice     4     (reduce) by 9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend     5     sea ice for their     6     (survive). “Sea ice is more than just the platform that the bears walk over,” says Andrew Derocher,     7     scientist who studies North American polar bear populations. “Without it, they can’t exist.”

    8     (melt) and refreezing of polar ice is natural. But in a warmer world, the cycle speeds up, and polar bears have less time     9     (hunt). Normally, they have three months in the spring when they gain more weight. The extra fat will be used, when the bears are not     10     (active) hunting.

In the past few years, quite a number of men and women     1    (choose) to do something less competitive. They are afraid that the stress of work robs them of joy and happiness and bring them harm both physically and mentally.

In fact, however, stress isn't such     2     bad thing. Above all, unless it     3    (get) out of control, a certain amount of stress is important as it provides motivation and challenge, and purpose to an otherwise     4    (mean), idle life. In addition, people under stress     5    (tend) to express their full range of potential and to realize their own personal worth - the very aim of a human life. Last but not least, research has showed that,     6    (actual), modest amounts of stress can     7     (strong) the immune system and be good for health.

Stress is a natural part of everyday life and there is no way     8     (escape). Developing our adaptive     9     (able) to deal with stress can prevent us from     10     (defeat) by the competitive society.

China’s Shenzhou-13 crew members Zhai Zhigang, Wang Yaping and Ye Guangfu livestreamed the first science lecture from the country’s space station on Thursday afternoon, which     1     (amaze) numerous students on Earth.

The lecture started at 3:40 p.m. (Beijing Time) and lasted about 45 minutes.     2       total of 1,420 primary and middle school students attended the lecture from five classrooms across China.

At the beginning of the class, Wang, the first female taikonaut     3     (enter) China’s space station, gave the students a tour of their living and working areas with the     4     (assist) of her two male crewmates.

She showcased their bedrooms and toilet, a     5     (full) functional kitchen, the area     6     they conduct scientific experiments and their fitness equipment, including a treadmill (跑步机) and a spin bike.

In the kitchen, she showed the students a microwave, a water dispenser and a mini-refrigerator     7     which she took out a fresh apple.

In response to a Hong Kong     8    (student) question about water, Wang said the water they drink is recycled,     9     (note) that there is no difference in taste between regular and recycled water. With a water recycling system, full use     10     (make) of every drop of water in the space station, she said.

The skin is an essential part of your body and its largest organ. We have three layers of skin which act     1    a barrier against poisons and the sun's     2    (harm) rays. Our skin’s functions are very complex. If it     3    (get) burned, it can be very serious. First aid is a very important first step in the treatment     4     burns. We can get burned by     5    variety of things: hot liquids, steam, fire, radiation, the sun, electricity or chemicals. There are three types of burns. They     6    (call) first, second and third degree burns,     7    (depend) on which layers of the skin are burned. Different types of burns have different characteristics. Here are some first aid treatments for the burns. Remove clothing and jewellery near the burn. Cool burns immediately with cold water. Use different     8    (method) to treat different types of burns. Dry the burned area     9    (gentle). Cover the burned area with a dry, clean bandage. If the injures are second or third degree burns, it’s vital     10    (get) the victim to the doctor or hospital at once.