Life is hard. And junior middle school students have every reason to say so.

      Recently, Zhejiang did {#blank#}1{#/blank#}survey of young people's mental health. It found that junior middle school students in Zhejiang feel the{#blank#}2{#/blank#} ( big ) pressure from school among teenagers. Besides, 48.8 percent of middle school students show signs of mental health problems.

       What are students{#blank#}3{#/blank#} ( worry ) about?

       {#blank#}4{#/blank#}, the class ranking after exams. Second, being{#blank#}5{#/blank#} ( able ) to reach their parents' expectation, ” the Youth Times reported.

This is not only true with Chinese students. The American Psychological Association recently did a similar survey. The results are{#blank#}6{#/blank#} ( surprise ): in the US, teenagers have a higher level of stress than adults. For them, one of the big reasons for stress{#blank#}7{#/blank#} ( be ) also schoolwork.

  {#blank#}8{#/blank#} can we do to help?

      To begin with, make sure you have an active life. Sleep for 9-10 hours a day, find someone to exercise with every day, and eat well, said Norman B. Anderson, an expert from the association. Also, try to keep away{#blank#}9{#/blank#}mobile phones and computers. {#blank#}10{#/blank#}you spend too much time on them, you will more likely feel upset, said experts.

    Many people say dolphins are very intelligent(聪颖的). They seem to be able to think, understand, and learn things quickly. But are they c{#blank#}1{#/blank#} like humans or more like cats or dogs? Scientists say dolphin intelligence is s{#blank#}2{#/blank#} to human intelligence in some ways. How?

    Like humans, every dolphin has a "name". I{#blank#}3{#/blank#} is a special whistle(哨声). Scientists think dolphins, like people," t{#blank#}4{#/blank#}"to each other about a lot of things, such as their age, their feelings, or finding food. And, like humans, dolphins use system (系统)of sounds and body language to c{#blank#}5{#/blank#}. But understanding their conversations is not easy for humans. No one "speaks dolphin" yet, but some scientists are trying to learn.

    Dolphins arc also social animals. They live in groups, and they often come to play games from different groups and have f{#blank#}6{#/blank#}, just like people. In fact, playing t{#blank#}7{#/blank#} is something only intelligent animals do.

    Dolphins and humans b{#blank#}8{#/blank#} make plans to get something they want. In the seas of southern Brazil, dolphins use an interesting way to get food. When fish are n{#blank#}9{#/blank#} a boat, dolphins signal (发信号) to the fishermen to put their nets in the water. And the men can catch a lot of fish. What is the advantage for the dolphins? Why do they h{#blank#}10{#/blank#} the men? The dolphins can get some of the fish.