China has set a new record for creating sustained high temperatures after the “artificial sun” ran five times     1     (hot) than the sun for more than 17 minutes.

The Experimental Advanced Superconducting Tokamak (EAST),    2     (know) as an“artificial sun”, reached temperatures of up to 70,000,000℃ during the experiment.

The extreme heat     3     (create) in a nuclear fusion reactor, which is part of the EAST project. It reproduces the natural     4     (reaction) that happen inside the sun and other stars. The scientists want to develop the “artificial sun” to provide a near-endless supply of clean energy     5     human beings.

Scientists around the world have been trying for decades to develop nuclear fusion. They say it is the best way     6     (produce) clean energy. The nuclear fusion process needs no fossil fuels     7     leaves behind no dangerous waste. If scientists can make it work, the world will become greener and cleaner. Nuclear fusion technology is still not     8     (advance) enough to become a global industry. However, the EAST project is an important step.

“The recent operation lays     9     solid scientific and experimental foundation towards the running of a fusion reactor,” said Gong Xianzu, a researcher at the Institute of Plasma Physics of the Chinese Academy of Sciences,    10     led the latest experiment.

In China, Tree Planting Day falls on March 12, but more often people plant trees during Qing Ming Festival in early April. Newly-planted trees can survive more     1     (easy) with a warmer climate and frequent spring rainfall at that time.

China set March 12     2     the National Tree-Planting Day in 1979     3     (honor) Sun Yat-sen, who died on March 12, 1925. Sun had called for planting trees.

Since 2013, Xi Jinping,     4     is the president of China, has joined Beijing citizens in tree planting activities for ten years in a row. President Xi called on     5     public to stick to the tradition of planting trees in spring. In 2017, he     6     (attend) a tree planting activity in Chaoyang district of Beijing and said, “Students should establish an     7     (aware) of protecting the environment and cherish the green plants”.

China has seen a     8     (remark) growth in forest resources and afforestation (造林) projects. Nationwide voluntary tree    9     (plant) campaigns in China over the past four decades have seen increased participation by members of the public and nearly 79 billion     10     (tree) have been planted. The campaign has made China the country with the largest increase in forest resources and the largest area of planted forests.

Tibetan antelopes live on the plains of Tibet, Xinjiang and Qinghai. When I     1     (watch) them move slowly across the green grass, I am struck by their     2     (beautiful). At the same time, I am also reminded     3     the danger they are in. Right now they     4     (hunt), illegally, for their valuable fur.

Zhaxi who works at the Nature Reserve (保护区) says, “    5     (actual), we are trying to save ourselves, not only the animals.” In the 1980-1990, the number of the antelopes     6     (reduce) by 50 percent. The hunters were shooting antelopes     7     (make) profits. Their habitats were becoming     8     (small) than before,     9     new roads and railways were built.

In order to save them, the government take     10     (effect) measures and the antelope population has recovered. In June, 2015, the Tibetan antelopes was removed from the endangered list.

Eradajere Oleita thinks she may have a solution     1     two of her country’s problems: rubbish and poverty (贫困). It’s called the Chip Bag Project. The 26-year-old student and environmentalist from Detroit is asking local chip lovers     2     (donate) their empty chip bags rather than throw them into the trash so she can turn them into sleeping bags for the homeless.

Chip eaters drop off their empty bags at two locations in Detroit: a print shop and a clothing store, where Oleita and other     3     (volunteer) collect them. After they clean the chip bags in soapy hot water, they cut them open, lay them flat, iron (熨) them together and use liners from old coats to line the insides.

It     4     (usual) takes about four hours to sew (缝) a sleeping bag, and each takes around 150 to 300chip bags, depending on whether they’re single-serve     5     family size. The result     6     (be) a sleeping bag that is waterproof (防水的), lightweight, and easy to carry around.

Since its start in 2020, the Chip Bag Project     7     (collect) more than 800,000 chip bags and created 110 sleeping bags.

Sure,     8     would be simpler to raise the money to buy new sleeping bags. But that’s only half the goal for Oleita—whose family moved to the United States from Nigeria ten years ago with the hope of     9     (have) a better life—and her volunteer helpers. “We are working to make a     10     (different) not only socially, but environmentally,” she says.

The Amazon rainforest is the largest rainforest in the world, which plays    1    significant role in maintaining the fine balance of the Earth's ecosystem. It crosses into eight     2     (country) and covers an area of around 6 million square kilometres. The Amazon River, from which the rainforest gets     3     (it) name, supports many different ecosystems on its journey. They give this area the    4     (rich) biodiversity on the Earth. Of the 390,000 plant species known to us, more than 40,000 can     5     (find) in the Amazon. Each level of the forest forms its own little world, home to different kinds of     6     (live) things. More than 1,300 species of birds and over 400 species of mammals hide among the jungle's plant life,     7    form the forest's food chain. The Amazon rainforest is often known     8     the “lungs of the planet”. However, over the past 50 years, about 17 per cent of the rainforest    9     (disappear) due to human activities. Can we afford     10     (damage) the “lungs of the planet"?