第一部分 词汇
【学习目标】
To master the new words, phrases and expressions.
【重点难点】
How to make students understand and master all the words and phases and use them properly.
Make students remember all the important contents including some sentence structures.
【学习内容】
Part1 Words and phrases
重点单词：
1. decrease
v. 减少；（使）变小；变少
n. 减少；降低；减少的数量，其后常接介词in/of
【拓展】
decrease (sth.) to/by ... 减少到/了……
