That voung man still denies__________the fire behind the store．
A. start
B. to start
C. having started
D. to have started
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类具有属性，它是对象的______的抽象，用______来描述类的属性。
You should be able to__________ right from wron9．．
A. perceive
B. distinguish
C. sight
D. observe
Lily：How about come to dinner with us tonight？Ann：__________．
A. I like to
B. 1 will
C. That’s a good idea
D. I"m afraid not
The“American sleep debt”（Line l，Para．3）iS the result of __________．
A. the traditional misconception the Americans have about sleep
B. the new sleep policy of the Clinton Administration
C. the rapid development of American industry
D. the Americans’worry about the danger of sleepiness
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