第二部分：英语知识运用（共两节，满分45分）
第一节：语法和词汇知识（共15小题；每小题1分，满分15分）
21. It is great shock for all of us to hear news that three university students lost their lives because of saving others.
A. the ; a B. /; a C. / ; / D. a; the
22. we can’t remove our trouble in life for ever, we can leave them behind when we are on vacation.
A. When B. While C. Unless D. Until
