单项选择题When salesmen are doing well, there is pressure upon them to begin ______ better, for fear they may start doing worse.

A. did
B. done
C. doing
D. do


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参考答案:B. secretly
2.单项选择题By ordinary standards these are ______ enough to qualify one as coming from Watts.

A. prove
B. credentials
C. show
D. attitude

参考答案:N. condemned
参考答案:J. practised
参考答案:A. establishment
参考答案:Q. mercy-killing
9.单项选择题And it is a ______ experience to have meals at the best big-city restaurants.

A. troubling
B. tiresome
C. gruesome
D. happy,