我国形成的对外开放格局的特点有(     )

①多层次    ②多渠道    ③全方位    ④宽领域

如图所示为“研究一定质量的气体在温度不变的情况下，压强与体积的关系”实验装置，实验步骤如下：

①把注射器活塞移至注射器满刻度处，将注射器与压强传感器、数据采集器、计算机逐一连接；

②移动活塞，记录注射器的刻度值V，同时记录对应的由计算机显示的气体压强值p；

③用V﹣ $\frac{1}{P}$ 图像处理实验数据，得出如图2所示图线．

澳大利亚特有的动物非常多，原因是（  ）

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   These years, with the development of society(社会), more and more teenagers have suffered from stress. Some of the problems can make them feel very w ____  and unhappy all day. Who can help them? A teacher from a college tried his best to help them. He thought of a lot of w____  to help them. On Monday and Thursday, you can c____  his hotline. Here are some ideas how to keep the young men healthier in every way.
   F____ , it is very important to keep healthy. To get e ____  sleep every day is also necessary. Try to have a healthy d____ every day. Secondly, maybe you are not the top student. It doesn’t m ____ . The most important thing is to work hard. If you try your best, your teachers and parents will understand you. If you have some problems, you should be a____   to talk with your teachers and parents. They can help you. Remember to s____  your happiness and s____   with your good friends. Sometimes you can go out for a walk.
In a word, you can try to make you happy by yourselves. I’m sure you can be happy every day.