Read the following article and select the best answer. Article: A recent study shows that young people in the UK aged between 11 and 15 spend, on average,52 hours a week in front of a screen.Dr.Aric Sigman, a researcher from the British Psychological Society,believes watching too much TV can cause health problems for children,including attention deficit disorder and obesity .He said children under three shouldn't watch TV at all. Children aged between three and seven should watch no more than 30 minutes to an hour of TV a day; 7 to 12-year-olds should be limited to an hour,and 12 to 15-year-olds should watch one and a half hours at most. Both adults and children believe that it can be difficult to cut down on screen time."It needs a bit of effort,but small steps can make a difference,"says Dr. Aric Sigman.He also offered some tips to change the family's TV habits. TVs and computers should be placed out of children's bedrooms.Watching TV before going to sleep doesn't help children to settle . Having the TV and computer in a family room also means that parents can know what they are watching and who they are talking to online.Parents can tell children how much time they can spend watching TV or playing computer games.Parents can tell children to do something different,such as playing games or going out for a bike ride.Dr. Aric Sigman says:"We went into lots of schools and the children told us they wished their parents would take them to the park and play with them." Question: According to Dr.Aric Sigman, _ . - children's screen time should be limited - most childhood obesity problems are caused by bad TV watching habits - children under seven shouldn't watch TV at all - it is not that difficult for children to cut down on screen time
children's screen time should be limited

Read the following article and select the best answer. Article: We know that hugs make us feel easy inside. And this feeling, it turns out, could actually _ stress and protect r the immune system, according to a new research from Carnegie Mellon University. It's a well-known fact that stress can weaken the immune system. In this study, the researchers sought to determine whether hugs----like social support more broadly ----could protect individuals from the increased sensitivity to illness brought on by the particular stress that come with interpersonal conflict. "We know that people experiencing ongoing conflicts with others are less able to fight off cold viruses. We also know that people who report having social support are partly protected from the effects of stress on psychological states, such as depression and anxiety, "the study's lead author, psychologist Dr. Sheldon Cohen , said in a statement. "We tested whether awareness of social support is equally effective in protecting us from sensitivity to infection caused by stress and also whether receiving hugs might partially account for those feeling of support and thus protect a person against infection." In the experiment , over 400 healthy adults filled out a questionnaire about their perceived social support and also participated in a nightly phone interview for two weeks . They were asked the frequency they engaged in interpersonal conflicts and received bugs that day.[:++Z+X+X+K] Then, the researchers exposed the participants to a common cold virus, and monitored them to assess signs of infection. They found that both perceived social support and more frequent hugs reduced the risk of infection associated with experiencing interpersonal conflict. Regardless of whether or not they experienced social conflicts, infected participants with greater perceived social support and more frequent hugs had less severe illness symptoms. "This suggests that being hugged by a trusted person may act as an effective means of conveying support and that increasing the frequency of hugs might be an effective means of reducing... Question: The passage aims to convey that _ . - hugs can have protective effects - social support can sure diseases - interpersonal conflicts cause infections - stress can weaken our immune system
hugs can have protective effects

Read the following article and select the best answer. Article: FROM 1964 to 1978, Dazhai, with a population of 500, was the most famous village in China. Millions of Chinese came to the Shanxi village to visit its terraced fields and "splendid" irrigation systems. It was not until 1978 when Guo Fenglian, head of the village, paid a visit to the US that China's model village found how far it had fallen behind those in developed countries. "I was astonished at their modern equipment in harvesting, which could even separate big tomatoes with small ones," said Guo. "American farmers' life quality also impressed me a lot. Every day they had two cups of milk, which is something we don't have even in our wildest dreams." "We have to learn their advanced technology and administration for our own development," said then first Deputy Prime Minister Deng Xiaoping who was planning China's reform and opening up policy then. "Through opening our doors, we would not only take advantage of foreign funds , but also create job opportunities and cultivate talents." In 1978 Japanese electricity giant Panasonic came to China as the first foreign business to invest here and its success attracted other world brands into exploring the Chinese market. So far China has for 15 years taken in the world's second biggest foreign investment, following the US, to help set the country in a fast growth. However, China's 30-year road of reform was not always smooth. Doubts on the reform began to rise at the end of the 1980s as many people worried the country would turn to capitalism . "The criterion for our judgment is whether it helps develop socialist productive forces, whether it helps increase the overall national strength of a socialist country, and whether it brings about better living standards," said Deng. "China's reform and opening up is a unique success story. It has brought benefit to both China and the world," said William Keller, chief manager of a Swiss pharmaceutical company. Question: According to remarks by Deng, which one is NOT the criterion for judging the success or failure of our work in various fields? - whether it helps develop socialist productive forces. - whether it strengthens the overall capacity of the country. - whether it brings about better investment and more profit. - whether it improves the peoples living standards.
whether it brings about better investment and more profit.