We all know that fish live in the water. But there is a kind of fish living in the desert. This kind of fish is called the lungfish. The lungfish is a type of freshwater fish best known for its   【小题1】(able) to live on land, without water, for months 【小题2】 end, and sometimes even for years.

Just 【小题3】 the name suggests, the lungfish has a highly evolved breathing system that can take oxygen straight from the air, like land animals. While it still lives in the water, the lungfish needs to regularly come up to the surface for air. And what is 【小题4】(astonish) is that the lungfish can even die if it is in the water for a long time. Therefore, it needs to avoid 【小题5】(put) underwater.

When in the water, the lungfish behaves like other types of fish, swimming and eating small fish at 【小题6】bottom of ponds and lakes. But when the dry season hits, the lungfish will bury itself deep into the mud, 【小题7】 it secretes mucus (分泌黏液) out of its skin that hardens to form a protective cocoon (防护膜) around it. Only the mouth 【小题8】(leave) for breathing.

Lungfish is one of the most ancient bony fish 【小题9】(discover)on Earth today. It is very much like the fish that 【小题10】(live) two hundred million years ago. And now lungfish is found only in Africa, South America and Australia.

According to a review of evidence in a medical journal, runners live three years【小题1】(long) than non-runners. You don’t have to run fast or for long【小题2】(see) the benefit. You may drink, smoke, be overweight and still reduce your risk of【小题3】(die) early by running.

While running regularly can’t make you live forever, the review says it is more effective at lengthening life【小题4】walking, cycling or swimming. Two of the authors of the review also made a study【小题5】(publish) in 2014【小题6】showed a mere 5 to 10 minutes a day of running reduced the risk of heart disease and early deaths from all【小题7】(cause).

The best exercise is one that you enjoy and will do. But otherwise … it’s probably running. To avoid knee pain, you can run on soft surfaces, do exercises to【小题8】(strength) your leg muscles, avoid hills and get good running shoes. Running is cheap, easy and it’s always【小题9】(energy). If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give【小题10】a try.

Chinese scientists have revealed the origin of calcium in first stars by using the world’s deepest underground laboratory in southwest China’s Sichuan Province, according to a study 【小题1】(publish) online Wednesday in the journal Nature.

In 2014, Australian astronomers observed the【小题2】(old) star ever known by human beings, a K-type red giant star named SMSS0313-6708, on【小题3】lithium, carbon, magnesium and calcium were observed. However, the origin of calcium in the star remained 【小题4】mystery. The China Jinping Underground Laboratory (CJPL),which【小题5】(be) 2,400 meters under a mountain in Sichuan Province, started operating in December 2010.

Chinese researchers carried 【小题6】relevant experiments in the laboratory. They【小题7】(success) verified the hypothesis that calcium comes from a key breakout reaction of carbon, nitrogen and oxygen cycle (CNO cycle),【小题8】(reveal) the origin of calcium in the star. The CJPL can greatly reduce the influence of cosmic【小题9】(ray) and provide unique conditions for direct measurement of important nuclear reactions of astrophysical interest, said He Jianjun of Beijing Normal University, the first corresponding author of the article.

Reviewers of the journal Nature commented that the study is a great【小题10】(experiment) success, and that it provides a new insight for future nuclear astrophysics studies.