第二部分：英语知识运用（共两节, 满分45分）
第一节：单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．We should realize valuable health is to each of us.
A．that B．how C．such D．what
22．--- Can we meet tomorrow afternoon?
--- Not in the afternoon, I’m afraid I .
A．will be working B．will work
C．am going to work D．am about to work
23．--- The woman biologist stayed in Africa studying wildlife for 13 years before she returned to her country.
--- Oh, dear! She a lot of difficulties.
A．may go through B．might go through
