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）
21.－Excuse me, Sir, is the swimming pool open all day?
－____.Only from 6:00 pm to 10:00pm.

A．That’s right

B．Yes, of course

C．Sorry, I’m not sure

D．Sorry, I’m afraid not