4. She felt _____ of having asked such a silly question when the audience couldn't help laughing.

　　A. guilty B. crazy C. miserable D. ashamed

　　[答案]D. ashamed.

　　[注释] be ashamed of 因......感到羞耻，惭愧：1)He is ashamed of what he was done.2)She felt ashamed of having done so little.(=She felt ashamed that she had done so little.) 3)John was ashamed to ask for help.(他不好意思向人求助。) 4)Jim was ashamed to have troubled me with so many questions.Be guilty of 犯有......罪，过失：1)He was found guilty. 2)I am not guilty of this crime.

　　5. The driver can adjust the heating in winter and the air conditioning in summer to suit his own _____.

　　A. leisure B. preference C. convenience D. selection

　　[答案]B. preference.

　　[注释]preference 偏爱，更加喜欢：My preference is for beef rather than for lamb.(我更喜欢牛肉面不是羊肉。)