64. We can infer from the text that humans and animals - —.

　　A. depend on one sense in choosing food

　　B. are not satisfied with their food

　　C. eat entirely different food

　　D. choose food in similar ways

　　65. Which of the following eats only one type of food?

　　A. The small bird.

　　B. The bear.

　　C. The fox.

　　D. The white butterfly.

　　66. Certain animals change their choice of food when ________

　　A. the food color changes

　　B. the season changes

　　C. they move to different places

　　D. they are attracted by different smells

　　D

　　On October 12, 1987, some Chinese scientists were working at the computers to look for information they needed. Suddenly they saw a lot of very bright spots(点 )crossing the computers’ screens. At the same time the computers were working much slower. To find out what was happening they stopped their work to check some parts of the computers. To their horror(恐惧), they found out that most of their stored information was got rid of( 除掉) by computer viruses! Obviously all these computers had been infected（感染 ） by computer viruses.

　　It is said that the computer viruses were made by a group of young man fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence.（才智）These kinds of computer viruses are named Jerusalem( 耶路撒冷 )Viruses. These viruses can stay in computers for a long time. When the time comes they will attack the computers by lowering the function(功能), damaging their normal programs or even getting rid of all the information.

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