在南极洲进行科学考察，需克服气候严寒等困难，南极洲气温极低的原因有  (    )    

此题为读、写数的综合练习，难度比较大。先写出数位顺序表，再根据读数时读零的几种情况把这七个数字组成一个七位数，答案不唯一。

    It is necessary to relax ourselves after the exam. There are some kinds of  activities for us to take part in. First of all, we can go for a w____ along the bank of the river. We can also go to the movies or listen to music. What's more, joining in a sports club is a good c____, which can keep us healthy. For example, p____ football in the afternoon may relax ourselves. Above all, we should arrange(管理) our time p____ and live a regular(规律的) life. I hope all of us can have a wonderful time.