集成运算放大器可实现的运算电路有（）。

单项选择题Everything was white and I remembered _____ all kinds of ladies dressed up in funny white things with all their hair covered with some sort of cloth.A:seeingB:seeC:to seeD:seen

单项选择题_____ is that he was blessed with a very good memory.A:What can be said with certainty of Richard NixonB:What of Richard Nixon with certainty can be saidC:What can say with certainty of Richard NixonD:What of Richard Nixon with certainty can say

单项选择题They prefer to repeat their success, rather than _____ failure.A:riskB:riskingC:to riskD:risked

单项选择题You can guess that there's not a man, woman or child that I don't know _____ sight.A:with B:inC:byD:through

单项选择题Instead of trying to imitate reality in their works, many artists of the early twentieth century _____ their feelings and ideas in abstract art.A:in the beginning to revealB:began to reveal C:revealed the beginningD:to begin revealing

单项选择题Helen believes if a man robs her of five dollars it is the same as if he _____ a hundred.A:takesB:will takeC:tookD:has taken

单项选择题If her marriage had not cut short her college education she _____ a teacher.A:would have beenB:would beC:had beenD:was

单项选择题I began the day _____ tennis with a secondary-school friend I hadn't seen for a while.A:playingB:playC:to playD:played

单项选择题The old saying _____ genius is one per cent inspiration and ninety-nine per cent perspiration is applicable for anyone who gets successful.A:whichB:ofC:thatD:what

单项选择题美国内战前，南方奴隶制种植园经济的实质是：（）A.欧洲移民发展的奴隶制经济 B.生产商品的奴隶制经济 C.使用奴隶从事商品生产的资本主义经济 D.受英国控制的殖民地经济