There are three characters on everyday stage. I’m the main character COVID-19 vaccine（新冠疫苗）, you are my partner nucleic acid test（核酸检测）. We have an enemy, his name is COVID-19（新型冠状病毒）.

Nowadays, COVID-19 is spreading around the world. He is very tiny but harmful, people can’t see him with their eyes. He can spread from one person to another easily and quickly. People are afraid of him because he can make them sick and have a fever. That’s why people stay at home and hide from him.

Then I’m coming, my name is vaccine, everyone needs me because there is no special medicine to treat COVID-19. I can help people to stay away from the virus（病毒）. People can get me for free, if they get me twice, they will have green health codes（健康码）with a needle（针）hat. Now people are supposed to get me a third time in the hospital. This can lower（降低）the risk of getting virus. With the third vaccine, people’s green health codes put on a shield（盾牌）, it’s also a passport to enter public places.

You are my best partner, nucleic acid test. People just need to stand there and open their mouths to take you. Doctors and nurses are working hard to check whether people have COVID-19 or not. They all think you are the most useful way.

So far, you and I have performed pretty well on this stage. Thanks to our strong country, we will pull together to make sure people can live a normal and safe life.

People now keep flat-faced (扁脸的) dogs such as French bulldogs as pets because they are cute. Some people call these dogs “lazy” because they get sleepier more easily than other dogs during the day. However, these cute dogs are having a hard time, according to a recent study.

Scientists at Eotvos Lorand University in Hungary watched 92 family dogs of different types while they were sleeping. During the study, the dogs spent about three hours with their owners in the sleep lab. With nothing special to do,the dogs soon fell asleep. At that time, the scientists recorded the dogs’ brain activities by an electroencephalogram (EEG, 脑电图), which doesn’t hurt the dogs.

The study found that the flat-faced dogs slept more than the other kinds. This may be because they don’t get enough sleep at night. The scientists explained that this is because of sleep apnea (睡 眠呼吸暂停症), which only happens in French bulldogs. During their sleep,they can’t get enough air and may find it difficult to breathe. It makes them often wake up during the sleep. Some French bulldogs may sleep while holding a toy ball in their mouths. Owners may think this is funny. But they’re doing it to keep their airways (呼吸道) open so they can breathe more easily.

This, however, is only one of the health problems dogs have because of breeding (培育). According to the website Pet Helpful, a lot of pet dogs are raised based on what people like, such as shorter legs, heavier bodies, and larger ears. Bulldogs are one of the victims.

Lots of pet lovers are asking people to respect dogs as they are. Owners must take the health of their dogs carefully instead of just for cuteness, Australian vet Karen Hedberg told ABC News.   

A．

B．

C．

D．

Height is just one of the thousands of features your genes (基因) decide.In fact, because you have two parents, your genes provide you with a height that usually lands somewhere between the heights of your parents. If both your parents are tall, then most probably you will be tall, too. If you have questions about how tall you’re going to be, ask your doctor if he or she can help you find it out.

But genes don’t decide everything. For example, eating an unhealthy diet can keep you from growing to your full potential (潜力). Getting plenty of sleep and enough exercise will help you grow to the expected height.

Maybe you’re wondering how fast you should grow. It depends. There’s no right answer. Generally speaking, kids grow about two inches (six centimeters) a year between age three and the time when they start puberty.

Your doctor will know how your growth has been going over the year. Two centimeters here and two inches there are not nearly as important as the height you’re at now, how you’ve been (growing up to this height, and what other changes your body may be going through.

Don’t be nervous if you seem to have grown a lot in a very short time. Everyone has a growth spur(高峰) during puberty. The age for starting puberty is about 10 for girls and about 11 for boys. But it can be earlier or later, between 7 and 13 for girls and between 9 and 15 for boys.

You’ll usually begin to notice that you’re growing faster about a year or so after your body starts to show the first changes of puberty.