1 . Extremely energetic light from space is an unexplained wonder. Scientists don’t know where that light comes from, exactly. And now astronomers have spotted this light, called gamma (伽马) rays, at higher energies than ever before.

You can’t see gamma rays with your naked eyes (肉眼). They are much more energetic than the light that we can see. So you need a fancy detector to spot them. The Large High Altitude Air Shower Observatory, LHAASO, is an experiment in China. It searches for extremely high energy gamma rays.

Scientists have spotted 12 gamma-ray hot spots. These are parts of the sky from which the gamma rays are sent out. Those hot spots show that our galaxy (银河系), the Milky Way, has powerful particle accelerators (粒子加速器). But those particle accelerators aren’t made by humans. Instead, they come from violent events in the universe. They might be exploding stars, for example. Such violent events make electric and magnetic fields, which can speed up protons (质子) and electrons. Those fast particles can then produce gamma rays with a lot of energy. That can happen when protons interact with other matter in space, for example.

Scientists aren’t sure what could produce gamma rays with the extreme energies observed. But the new observations point to two possibilities. One hot spot was associated with the Crab Nebula. That’s the remains of an exploded star. Another possible source was the Cygnus Cocoon. That’s a region where massive stars are forming. The stars send out strong winds in the process.

LHAASO is located on Haizi Mountain in China’s Sichuan province. It is not yet fully operational. It’s due to be completed later this year. Then, it could find even more gamma rays.

2 . Children should do housework. That’s a controversial (有争议的) idea, though not everyone will admit it. A few parents will say that their children are too busy for housework. Many more of us assign (分派) housework, or say we believe in them, but the housework just doesn’t get done.

That’s a problem. For starters, housework is good for kids. Being a part of the routine work of running a household helps children develop an awareness of the needs of others, while at the same time contributing to their emotional well-being.

One small study, done over a period of 25 years, found that the best predictor (预测) for young adults’ success in their mid-20s was whether they participated in household tasks at age 3 or 4. Those early shared responsibilities extended to a sense of responsibility in other areas of their lives.

But for all that their help matters, few kids are doing much around the house at all. In a survey of 1,000 American adults, 75 percent said they believed regular housework made kids “more responsible”. Yet while 82 percent reported having had regular housework growing up, only 56 percent of those with children said they required them to do housework.

Sports and homework are not get-out-of-housework-free cards. The goal, after all, is to raise adults who can balance a caring role in their families and communities with whatever lifetime achievement goals they choose. Housework teaches that balance.

What should you do when getting children to do housework? Accept no excuses. Don’t worry if you must repeat yourself again and again. If you’re spending more time getting the child to do this job than it would take to do it yourself, then you’re doing it right. Can a payment help? Maybe. But if you’re trying to teach kids to share the responsibility of a home, paying them for routine housework is not the right message.

Nowadays, football is one of the most popular sports in     1    world. Its history    2     (go) back over two thousand years to ancient China, and it was known as cuju then. Modern football started in Great Britain,    3     the new game rules were made.

Football is simple and very cheap    4    (play), which is perhaps the basis of the popularity. People needn’t expensive equipment    5    the football doesn’t cost much money.

Another factor behind    6    (it) global popularity is the creativity on the field. It is attractive    7    millions of people. People can see children playing with a ball everywhere. People also can feel the    8    (excite) of a game even without recognizing the skill of professional players.

What’s more, it has become one of the    9    (good) ways for people to communicate. It doesn’t require    10    (word), but everyone can understand it. It breaks down walls and brings people together on and off the field.