题目内容
假设某条指令的第一个操作数采用寄存器间接寻址方式，假定指令中给出的寄存器编号为8，8号寄存器的内容为1200H，地址为1200H单元中的内容为12FCH，地址为12FCH单元中的内容为38D8H，而38D8H单元中的内容为88F9H，则该操作数的有效地址为（）。
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People produce food in many ways.Agriculture，or farming，developed thousands of years ago. ___11___about 100 years ago, most farmers in the United States Produced only enough food for their own___12___Today,modern equipment and farming methods have greatly ___13___the American farmer’s productivity.
In various parts of the world,people___14___many animals that supply meat and milk. Cattle, horses, goats, sheep, and pigs are important food animals. In the United States, the cow is the major source of milk products. Chickens___15___ people with both meat and eggs.
Fishing is an important source of food, ___16___in areas near the sea. Some countries, like Japan, consume much more fish than meat.
The wealthy areas of the world consume the most food , ___17___include the United States, Canada, and Europe. Many countries are able to import food if it cannot be produced at home. ___18___Great Britain imports about 75percent of its meat，and grows less than half the food its people require.
___19___people of the poor countries of the world usually eat only what they are able to produce themselves. In some parts of Asia, people live ___20___rice alone.
11.A.In B.Until C.From D.for
12.A.needs B.reasons C.efforts D.interests
13.A.protected B.supported C.increased D.reflected
14.A.grow B.raise C.train D.store
15.A.prepare B.treat C.serve D.provide
16.A.certainly B.actually C.occasionally D.especially
17.A.these B.where C.which D.they
18.A.In addition B.For example C.Above all D.After all
19.A.However B.Therefore C.Moreover D.instead
20.A.with B.for C.on D.through
某机器指令字长为16位，主存按字节编址，取指令时，每取一个字节PC自动加1。当前指令地址为2000H，指令内容为相对寻址的无条件转移指令，指令中的形式地址为40H。那么取指令后及指令执行后PC内容为（）。
指令寻址方式有顺序和跳跃两种，采用跳跃寻址方式可以实现（）。
（汉译英）现在我们意识到环境污染已成为一个日益严重的问题。
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