在一幅平面图上用6厘米表示480米，这幅平面图的比例尺是 $\frac{1}{80}$ ．

用括号中所给单词的适当形式填空。
（1） It's____(real)cold today.
（2）This____(write)writes lots of interesting stories for kids.
（3）Many people don't enjoy____(live)in big cities.
（4）I am in my____(three)year in this middle school.
（5）As we all know，the weather in southwest China is____(dry)than any other time in history

读中国四大地理区域分布图，完成下列问题．