本期词汇：
1. expensive 昂贵的
eg： One reason is that the tickets are more and more expensive.
一来票价越来越贵。
2. reasonable 合理的
eg：We all expect buying and selling at reasonable prices.
我们都希望买卖公平。
本期题目：
写出单词并拼写！
1.合理的
2.昂贵的
答案：
1.reasonable，
r-e-a-s-o-n-a-b-l-e
2.expensive
e-x-p-e-n-s-i-v-e