二、选择填空（共25小题；每小题1分，满分25分）
A)单项填空从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Eating ______apple _______day keeps the doctor away.
A. an; an B. a; an C. an, a D. a; a
22. _______Walkman is not so expensive as _______but it works well, too.
A. My; his B. Mine; him C. My; him D. Mine; his
23. Audrey Hepburn was born in Belgium _______4th May 1929.
A. at B. in C. on D. from
