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在面向对象程序设计中，我们所说的对象具有4个主要的特性，它们分别是：抽象性、________、________和________。
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Reading ComprehensionSection ADirections: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than onceQuestions 1 to 10 are based on the following passage.The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday.While elderly people 1 to sleep for fewer hours than they did when they were younger, this has a(n) 2effect on their brain's performance and they would benefit from getting more, according to research.Sean Drummond, a psychiatrist （心理医生） at the University of California, San Diego, said that older people are more likely to suffer from broken sleep, while younger people are better at sleeping 3straight through the night.More sleep in old age, however, is 4 with better health, and most older people would feel better and more 5 if they slept for longer periods, he said.“The ability to sleep in one chunk （整块时间） overnight goes down as we age but the amount of sleep we need to 6 well does not change,” Dr Drummond told the American Association for the Advancement of Science conference in San Diego.“It's 7a myth that older people need less sleep. The more healthy an older adult is, the more they sleep like they did when they were 8 . Our data suggests that older adults would benefit from 9 to get as much sleep as they did in their 30s. That's 10from person to person, but the amount of sleep we had at 35 is probably the same amount as we need at 75.”A) alertE) continuingI) formallyM) sufficientB) associatedF) definitelyJ) functionN) tendC) attractingG) differentK) mixedO) youngerD) clingH) efficientlyL) negative
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