题目内容
8031单片机有4个口，其中______口可以直接应用于I/O口。
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Directions: There are 4 passages in this part. Each of the passages is followed by 5 questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D.Passage One SYDNEY: As they sat sharing sweets beside a swimming pool in 1999, Shane Gould and Jessicah Schipper were simply getting along well, chatting about sport, life and "anything else that came up." Yet in Sydney next month, they will meet again by the pool, and for a short time the friends will race against each other in the 50-meter butterfly (蝶泳) in the Australian championships at Homebush Bay. Gould, now a 47-year-old mother of four, has announced she will be making a return to elite competition (顶级赛事) to swim the one event, having set a qualifying time of 30.32 seconds in winning gold at last year’s United States Masters championships. Her comeback comes 32 years after she won three golds at the Munich Olympics. Schipper, now a 17-year-old from Brisbane with a bright future of going to Athens for her first Olympics, yesterday recalled her time with Gould five years ago. "I was at a national youth camp on the Gold Coast and Shane had come along to talk to us and watch us train," Schipper explained. "It seemed as if we had long been good friends. I don’t know why. We just started talking and it went from there." "She had a lot to share with all of us at that camp. She told us stories about what it was like at big meets like the Olympics and what it was like to be on an Australian team. It was really interesting. " Next time, things will be more serious. "I will still be swimming in the 50m butterfly at the nationals, so there is a chance that I could actually be competing against Shane Gould," said Schipper, who burst onto the scene at last year’s national championships with second places in the 100m and 200m butterfly. The underlined word "it" in the fifth paragraph probably refers to ______.
Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D. One summer day my father sent me to buy wire for our farm. At 16, I liked (76) better than driving our truck, (77) this time I was not happy. My father had told me I’d have to ask for credit at the store. Sixteen is a (78) age, when a young man wants respect, not charity. It was 1976, and the ugly (79) of racial discrimination was (80) a fact of life. I’d seen my friends ask for credit and then stand, head down, while the store owner (81) whether they were "good for it." I knew black youths just like me who were (82) like thieves by the store clerk each time they went into a grocery. My family was (83) . We paid our debts. But before harvest, cash was short. Would the store owner (84) us. At Davis’s store, Buck Davis stood behind the cash desk, talking to a farmer. I nodded (85) I passed him on my way to the hardware shelves. When I brought my purchases to the cash desk, I said carefully, "I need to put this on credit."
对8255的C口D3位置1的控制字是：______。
Passage Two That cold January night, I was growing sick of my life in San Francisco. There I was, walking home at one in the morning after a tiring practice at the theatre. With the opening night only a week from now on, I was still learning my lines. I was having trouble dealing with my part-time job at the bank and my acting at night at the same time. As I walked, I thought seriously about giving up both acting and San Francisco. City life had become too much for me. As I walked down empty streets under tall buildings, I felt very small and cold. I began running, both to keep warm and to keep away from any possible robbers. Very few people were still out except a few sad-looking homeless people under blankets. About a block from my apartment, I heard a sound behind me. I turned quickly, half expecting to see someone with a knife or a gun. The street was empty. All I saw was a shining streetlight. Still, the noise had made me nervous, so I started to run faster. Not until I reached my apartment building and unlocked the door did I realize what the noise had been. It had been my wallet falling to the sidewalk. Suddenly I wasn’t cold or tired anymore. I ran out of the door and back to where I’d heard the noise. Although I searched the sidewalk anxiously for fifteen minutes, my wallet was nowhere to be found. Just as I was about to give up the search, I heard the garbage truck (垃圾车) pull up to the sidewalk next to me. When a voice called from the inside, "Alisa Camacho" I thought I was dreaming. How could this man know my name the door opened, and out jumped a small red-haired man with an amused look in his eye. "Is this what you’re looking for" he asked, holding up a small square shape. It was nearly 3 am by the time I got into bed. I wouldn’t get much sleep that night, but I had gotten my wallet back. I also had gotten back some enjoyment of city life. I realized that the city couldn’t be a bad place as long as people were willing to help each other. In the fifth paragraph, why did the writer say she was dreaming
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