假设（AL）=0FFH，依次执行ADDAL，12和ANDAL,0FH指令后，标志位Z_爱下问搜题

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问题单项选择题

假设（AL）=0FFH，依次执行ADDAL，12和ANDAL,0FH指令后，标志位ZF和SF的状态分别为【】。

A．0和0

B．0和1

C．1和0

D．1和1

答案

参考答案：A

解析：由于AL中内容为0BH(12)，执行ANDAL，0FH指令后，AL中的结果不变，仍然是0BH，值不为0，且为正数，所以ZF：零标志为0，SF：符号标志为0。

完形填空

In 1957, Jane Goodall first met the famous anthropologist (人类学者) Dr Louis Leakey, who later played an important role in her life. With the 32 of gaining insight into humans’ evolutionary (进化的) past, Dr Leakey 33 a pioneering long-term field study on 34 chimps. Even though Jane had no formal 35 , her patience and determination to understand animals 36 him to choose her for the study. 37 it was unusual for a woman to work in the forest of Africa, going there 38 the fulfillment (实现) of her childhood dream. In the summer of 1960 she 39 in Tanzania(坦桑尼亚) on Lake Tanganyika’s eastern shore. This marked the 40 of the longest continuous field study of animals in their 41 habitat(栖息地). Five years 42 , she earned a doctor’s degree at Cambridge University and then 43 to Tanzania to found the Gombe Stream Research Center. And in 1977, to provide on-going 44 for chimp research, Dr Goodall 45 The Jane Goodall Institute.
Today, she 46 most of her time traveling around the world, giving lectures on her 47 at Gombe and speaking to school groups about Roots &Shoots, her environmental education and humanitarian program for the 48 .
“Chimps have given me so 49 . The long hours spent with them in the 50 have enriched my life beyond measure. What I have learned from them has shaped my 51 of human behavior, of our place in nature.”

D．achievement

A．environment

C．experiences

A．imagination

C．understanding

单项选择题

可编程序控制器（PLC）除主要应用于顺序控制和开关控制外，还可应用于（）。

A.模拟控制

B.信号报警和联锁系统

C.通信系统

D.以上三项