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My name is Li Hua. I am graduate from Zhongshan senior high school. There are four 1in my family. My father works in a computer 2. And my mother is 3 housewife. I am the 4 one in my family.In my spare time, I like to 5novels. I think reading could enlarge my knowledge. As for novels, I could imagine whatever I like such as a well-known scientist or a kung-fu master. In addition to reading, I also like to play PC 6. A lot of grownups think playing PC games hinders the students from learning. But I think PC games could motivate me to 7 something such as English or Japanese.My 8course is English because I think it is interesting to say one thing via different sounds. I wish my9 could be improved in the next four years and be able to10fluent English in the future.

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Mr Black has a lot of friends and is very popular at parties. He is very good 1telling interesting stories and those stories often make people 2 . Everyone enjoys listening to him. Mr Black has a 3. Her name’s Kelly. She is only four4old and she can’t understand all the stories. A few days ago, one of Mr Black’s friends asked him5some stories at a birthday party. Mr Black agreed 6because he loved to do so. On that day Mr Black went to the birthday 7with his daughter. At the party he told many interesting stories. The people there laughed a lot and gave thanks to him for the great joy. Mr Black was very 8. When he finished the talk, Kelly told him she wanted to leave. Mr Black was a little surprised 9he did as his daughter asked. On their way home, he asked Kelly 10 she enjoyed the stories.“No, I didn’t. I didn’t like to see so many people laughing at you.”

采用 80C51 的定时器 T0 定时,用模式 2,则应 ______。21

A. 启动 T0 前先向 TH0置入计数初值,TL0置 0,以后每次重新计数前都要重新置入计数初值
B. 启动 T0 前先向 TH0、TL0 置入计数初值,以后每次重新计数前都要重新置入计数初值
C. 启动 T0 前先向 TH0、TL0置入计数初值,以后不再置入
D. 启动 T0 前先向 TH0、TL0置入相同的计数初值,以后不再置入

80C51单片机定时器 T0 的溢出标志 TF0,当计数满产生溢出时,其值为 ______。

A. 0
B. 0xff
C. 1
D. 计数值

80C51的定时器 T1 用作计数方式时, _____。

A. 外部计数脉冲由 T1(P3.5引脚 )输入
B. 外部计数脉冲由内部时钟频率提供
C. 外部计数脉冲由 T0(P3.4 引脚 )输入
D. 外部计数脉冲由 P0 口任意引脚输入

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