三、知能提升：
（一）重点单词
［单词学习］
1. waste
【用法1】n. 浪费
【例句】These meetings are a waste of time. 这些会议真是浪费时间。
【用法2】v. 浪费
waste sth. on sth. 在某物/某事上浪费钱财、时间等；
waste time (in) doing sth. 浪费时间做某事。
【例句】Why do you waste money on clothes you don’t need?
You are wasting your time (in) trying to explain it to him.
