4 . The rate of childhood obesity in the U. S. has tripled over the past 50 years. The American Academy of Pediatrics (AAP) made waves this year by recommending that doctors put obese kids as young as two years old on intensive, family-oriented lifestyle and behavior plans. It also suggested prescribing weight-loss drugs to children l2 and older and surgery to teens 13 and older. This advice reflects the organization’s adoption of a more active position on childhood obesity.

Yet the lifestyle programs the AAP recommends are expensive, inaccessible to most children and hard to maintain. Few weight-loss drugs have been approved for children. And surgery has potential risks and few long-term safety data. Furthermore, it’s not clear whether interventions in youngsters help to improve health or merely add to the psychological burden overweight kids face from the society.

Rather than paying close attention to numbers on a scale, the U. S. and countries with similar trends should focus on an underlying truth: we need to invest in more and safer places for children to play where they can move and run around, climb and jump, ride and skate.

Why is it so hard to get kids moving? Experts blame the problem on the privatization of sports — as public investment in school-based athletics dwindles, expensive private leagues have grown, leaving many kids out. In addition to fewer opportunities at school, researchers cite increased screen time and a lack of safe places for them to play outside the home. New York City, for example, had 2,067 public playgrounds as of 2019 — a very small amount for its large population. In Los Angeles in 2015, only 33 percent of youths lived within walking distance of a park.

Kids everywhere need more places to play. Public funding to build and keep up these areas is crucial, but other options such as shared-use agreements can make unused spaces available to the public. These opportunities aren’t primarily about changing children’s waistlines — they’re how we keep childhood healthy and fun.

It is said that about half of the people in China smoke. Many young boys and girls have the habit of     1     (smoke), though they are middle school students.

More and more people have come to realize     2     serious this problem is. But they are never bored with it. Some people think it is a kind of fashion; some think it is of great fun     3     others think that smoking can refresh     4     (they).

Smoking causes many     5     (illness). A lot of people always cough because of smoking. The most serious illness     6     (cause) by smoking is lung cancer. At the same time smoking is a waste     7     money. Besides, careless smokers may cause     8     (danger) fires.

As we all know, smoking     9     (do) great harm to human beings. In order     10       (keep) healthy, we should get rid of the bad habit of smoking. Please stop smoking at once.

Many young people wants     1     (become) great athletes. They exercise and lift weights in the gym. But the fact is that they don’t become stronger,     2     makes them unhappy.

Therefore, some of them are considering     3     (take) pills, which they think will help them become     4     (strong) than before. However, the truth is that these pills usually have some unintended side     5     (effect). Some of them may even affect     6     (they) liver or heart.     7     fact, some great athletes such as Griffith Joyner, died very young because they     8     (take) some pills.

For the above reasons, I suggest that young people be     9     (care) not to take pills.     10     best way to become stronger is going to a gym to work out.

9 . California has been using recycled wastewater for many years. A team has used it to make ice surfaces for the game of hockey(冰球运动). It has been used to make snow for the sport of skiing. And farmers use it to water their crops. But it has not been used directly for drinking water.

Recently, California officials approved new rules to let water agencies recycle wastewater and put it right back into the pipes that carry drinking water to homes, schools, and businesses. It is a big step for California.

California’s new rules would let—but not require—water agencies to take wastewater, treat it, and then put it right back into the drinking water system. That means proving to people that recycled water is not only safe to drink but also not dirty. California would be just the second US state to permit this, following Colorado. It has taken officials more than 10 years to develop these rules, a process that included several studies by independent groups of scientists.

A project in San Diego is aiming to produce nearly half of the city’s water through recycling wastewater by 2035. And the Metropolitan Water District of Southern California aims to produce up to nearly 570 million liters(升)a day for its 19 million people. Adel Hagekhalil is with Metropolitan Water. He said the new rules will permit new projects that have not yet been considered.

California’s new rules require the wastewater be treated for all bacteria and viruses, even if they are not present in the wastewater. In fact, the treatment is so intense that it removes all of the minerals that make fresh drinking water taste good. That means the minerals need to be added back at the end of the process. Polhemus is a director of the drinking water group for the California Water Resources Control Board. “It’s at the same drinking water quality, and probably better in many instances,” he said, adding that it takes time and money to build these treatment centers. So, they will only be available for bigger cities at first.

10 . Pet owners love their dogs more than their cats. Although previous studies have already suggested this finding, scientists from the University of Copenhagen wanted to research more deeply into whether cultural factors affected the results. Their findings are published in the journal Frontiers in Veterinary Science.

In the survey across Denmark, Austria and the United Kingdom, 844 dog owners, 872 cat owners and 401 people who owned both dogs and cats were asked questions about their pets. Overall, the participants had higher attachment scores for dogs than for cats. Owners were more likely to insure (给……投保) their dogs and paid more to dogs’ treatment. However, the results differed dramatically across countries. For example, the United Kingdom’s results were in favor of dogs, although only slightly. Australia had a very clear preference for dogs. Emotional attachment to dogs was highest in Denmark. The Danes were also less likely to buy insurance for their cats, compared with their dogs.

“While people care more about their dogs than their cats in these countries, the degree of difference varied between countries,” Professor Peter Sandoe of the University of Copenhagen, the study’s first author, said in a press release. “It doesn’t therefore seem to be a universal phenomenon (现象) that people care much less about their cats than their dogs.”

The difference between countries may be due to cultural differences and attitudes toward pets, the study suggested. This may be the result of the country’s history with rural animals and how often they interacted with people. These factors may have influenced societal attitudes toward pets in modern times.

“Our study only looks at three countries in Europe,” professor Clare Palmer of Texas A&M University, a co-author of the paper, said in the press release. “It raises interesting questions regarding what comparative studies of other countries might find,” she went on. “Perhaps there are countries where the level of care for and attachment to cats is, in fact, higher than dogs?”