We assume exercise improves our mental health. But what kind of exercise works best? Researchers analyzed the effect of different types of exercise. They looked at the link between physical activities and mental health and found team sports were the best, followed by cycling, either on the road or a stationary bike. Physical activities typically performed in groups, such as team sports and gym classes, provided greater benefits than running or walking.
Researchers rated mental health based on a survey. It asked respondents how many days in the previous month their mental health was “not good” due to stress, depression or problems withemotions. People who played team sports like soccer and basketball reported 22.3% fewer poor mental-health days than those who didn’t exercise. Those who ran or jogged fared 19% better, while those who did household chores 11.8% better.
They found team sports may have an extra benefit because of the social component, and yoga or tai chi can promote mindfulness, which is often touted as beneficial for mental health.
The researchers also found that those who exercise between 30 and 60 minutes had the best mental health, with 45 minutes the optimal duration. Exercising three to five times a week correlated with fewer dark days. “Over 90 minutes of exercise and there isn’t an extra benefit,” Dr. Chekroud said.
The study analyzed the exercise habits and mental health of 1.2 million US adults, based on self-reported answers to survey questions from the Centers for Disease Control and Prevention. It wasn’t a randomized controlled study and just an association between exercise and better mental health. It can’t explain if poor mental health causes people to exercise less or exercise causes people to have better mental health.
1.Which exercise will best help to cheer up the depressed?
A.Running and jogging outdoors. B.Playing soccer and basketball.
C.Doing some household chores. D.Cycling or riding a stationary bike.
2.What do the researchers say about team sports?
A.They boost self-esteem. B.They offer inner peace.
C.They involve interaction. D.They help achieve goals.
3.What Dr. Chekroud said means that_______.
A.more exercise isn’t always better
B.exercise habits decide mental health
C.exercise leads to better mental health
D.mental health causes people to exercise
4.What can be a suitable title for the text?
A.What sports work best for mental health? B.More exercise, better mental health!
C.Less exercise, poor mental health! D.What is the good effect of exercise?
Artificial intelligence (Al) technology may soon be a useful tool for doctors. It may help them better understand and treat diseases like breast cancer(癌症)in ways that were never before possible.
Rishi Rawat teaches Al at the University of Southern California's (USC) Clinical Science Center in Los Angeles. He is part of a team of scientists who are researching how Al and machine learning can more easily recognize cancerous growths in the breast. Rawat provides information about cancer cells to a computer. He says this data helps the machine learn."…You can put the data into them and they will learn the patterns and the pattern recognition. That's important to make decisions.”
David Agus is another USC researcher. He believes that "machines are not going to take the place of doctors." Computers will not treat patients, but they will help make certain decisions and look for things that the human brain can't recognize these patterns by itself." Once a confirmed cancerous growth is removed, doctors still have to treat the patient to reduce the risk of cancer returning. The form of treatment depends on the kind of cancer. Currently, researchers take a thin piece of tissue (动植物细胞的组织)，put it on a small piece of glass and add color to better see the cells .
That process could take days or even longer. Scientists say Al can do something better than just count cells. Through machine learning, it can recognize complex patterns or structures, and learn how the cells are organized. The hope is that machines will soon be able to make a quick identification of cancer that is free of human mistakes. "A11 of a sudden, we have the computing power to really do it in real time... We couldn't have done this, we didn't have the computing power to do this several years ago, but now it's all changed." Agus adds that the process could be done "for almost no cost in the developing world.” He says that having a large amount of information about patients is important for a machine to effectively do its job in medicine .
The University of Southern California researchers are now only studying breast cancer. But doctors predict Al will one day make a difference in all forms of cancer.
1.Many diseases like breast cancer will soon be ______.
A.cured with Al B.treated with Al
C.prevented with Al D.removed with Al
2.What can we infer from Agus' s words in Paragraph 3?
A.Al technology is to replace doctors.
B.Computers can be an aid to the human brain.
C.Computers can work well with little information.
D.Al technology is not accessible to developing countries.
3.What does the underlined word “it” in Paragraph 4 refer to?
A.Helping to count cells. B.Recognizing complex patterns.
C.Making a quick and right identification. D.Learning how the cells are organized.
4.What does this passage mainly talk about?
A.Research in breast cancer. B.Potential of Al for doctors.
C.Imagination about Al' s future. D.Achievements on medical care.
As a winner of the NSLI-Y Scholarship in high school, and then the Critical Language Scholarship in college, I lived in China for two summers with host families, studying Chinese for nine hours a day. Tack on to that the approximately 2,000 classroom hours I spent learning Chinese as an undergraduate, and it seems fair to say that a small fortune of resources has been invested in my Chinese ability.
Yet even with so much practice, I am not still achieving fluency, and it's unclear whether I’ll use my language skills regularly in my career. This leads me to reflect: What is it that drives me to drill tones and memorize characters?
Many people are quick to point out the value of language skills in an increasingly competitive workforce. However, language is about much more than just the ability to communicate. Foreign language study is tied to increased levels of empathy (同理心)，enhanced cognitive development, and more creative insight on the human condition. Increasingly, research shows that these benefits also apply to those with exposure to multiple languages, and not just those who achieve fluency.
A beneficial future for the US and China will be built upon understanding, respect and recognition. Language exchange can provide cultural insight and strengthen the common ground we stand on.
It is not the economic potential of my language skills that leads me to persist. Studying Chinese is the most modest way I can think of to approach China, a nation with over 5 ,000 years of complex history. From this point, I have experienced the beauty, hospitality of China. And my experience of studying Chinese has helped me form a sense of curiosity and a commitment to understanding and respect-and that's a start.
1.What do we know about the author?
A.He has worked hard at learning Chinese.
B.He has won many scholarships in China.
C.He began to learn Chinese in high school.
D.He has enjoyed his life living in China.
2.What does the author think of the language learning?
A.It just needs to drill tones and remember words.
B.It needs the experience of living with a host family.
C.It can promote learners' mental development.
D.It is only used for effective communication.
3.What can we infer from Paragraph 4?
A.The US and China will certainly have a bright future.
B.The US and China always respect and recognize each other.
C.Language exchange can help the US and China understand better.
D.The US and China start to share the same cultural insight.
4.Why does the author stick to learning Chinese?
A.To get some economic profits. B.To show off his language talent.
C.To achieve the language fluency. D.To have a close look at China.
Four Excellent American Universities Princeton University
Princeton University is a private institution founded in 1746. Located in Princeton, New Jersey, it offers various events, activities and organizations. Famous alumni include the 28th US President Woodrow Wilson and former first lady Michelle Obama.
Harvard University
Harvard University is a private institution founded in 1636. Located outside Boston in Cambridge, Massachusetts, it is made up of more than 10 schools and institutes. Eight US presidents graduated from Harvard, including Franklin Roosevelt and John F. Kennedy.
Massachusetts Institute of Technology
MIT is a private institution founded in 1861. Located outside Boston in Cambridge, Massachusetts, MIT focuses on scientific and technological research. Famous alumni include Apollo 11 astronaut Buzz Aldrin and former UN Secretary General Kofi Annan.
Yale University
Yale University is a private institution founded in 1701. Located in New Haven, Connecticut, it is known for its excellent drama and music programs. Famous alumni include five US presidents and actress Meryl Streep.
1.Which university has the longest history?
A.Princeton University. B.Harvard University.
C.Massachusetts Institute of Technology. D.Yale University.
2.What do we know about Yale University?
A.It provides various events, activities and organizations.
B.It concentrates on scientific and technological research.
C.It is the university that John F. Kennedy graduated from.
D.It is known for its excellent drama and music programs.
3.What do the four universities have in common?
A.They are all private institutions. B.They are all named after cities.
C.They are all located in Cambridge. D.They all have more than 10 schools.
听下面一段独白，回答以下小题。
1.What is the speaker?
A.An environmental official. B.A program producer. C.A scientist.
2.Where did the speaker do the task?
A.In a boat. B.At a university. C.At a TV station.
3.Why are the sharks returning?
A.There is more food to eat . B.The water quality is better. C.Hunting is forbidden.
听下面一段较长对话，回答以下小题。
1.What is the woman doing?
A.Doing a survey. B.Hosting a program. C.Forecasting the weather.
2.Which place experienced many thunderstorms last month?
A.England. B.Wales. C.America.
3.What should the normal temperature be in India at this time of year?
A.42 degrees. B.45 degrees. C.48 degrees.
4.What is the weather like in Switzerland?
A.It is extremely hot. B.It has strong winds. C.It rains heavily.
