The sun, the moon and the stars(星星)are all in the sky. We see the moon and the stars at night. The sun is a ball. It's much bigger than the moon. It gives us heat(热量). The sun has a family. It's the biggest member of the family. The moon is a ball, too, like the sun and the earth. Sometimes it looks as round as a plate(盘子). Sometimes it looks half a plate. It looks bigger because it's much nearer to the earth. It's much smaller than the sun. It's smaller than the stars. The light on the moon comes from the sun. It has no light of its own.
   The stars look smaller than the sun. They look small because they are very far away from us. All day the stars are in the sky. But the light from the sun is too bright. We can't see the stars in the day.

下图为“我国某地区1月等温线图”。读图完成下列各题。

“独学而无友，则孤陋而寡闻。”这句话说明（   ）  

                                         A    

    People's hobbies aren't always the same. They change with many things. Here are some examples:

Age

    Hobbies change with your age. When you're a kid, you may be interested in playing games, collecting toys etc. When you study at school, you may be interested in sports, pop music and movie stars. When you're old, you may be interested in chatting and listening to Beijing Opera.

Job

    Hobbies change with people's jobs. Teachers may like staying with their students. Doctors may like all kinds of medicine. Drivers may like all kinds of vehicles and athletes may like all kinds of sports games.

Season

    Hobbies change with seasons. People may have different hobbies in different seasons. In spring, you may like flying kites. In summer, swimming is a good choice(选择). In autumn, you may like to go hiking and in winter, skating must be great fun.