第二部分：英语知识运用
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. Jumping out of ______ airplane at ten thousand feet is quite ______ exciting experience.
A. an; an B. /; the C. /; an D. the; the
22. Mr. Smith was thinking about how to explain to the manager why he was late for work, when a good idea ______ to him.
A. happened B. brought C. occurred D. struck
23. When he came back with plenty of money, his father ______ three days before.
A. had died B. was dead C. died D. had been dead
24. Americans eat vegetables per person today as they did in 1990.
A. more than twice B. as twice as many
C. twice as many as D. more than twice as many
