题目内容
OSI模型的______具有桥接功能。
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A …………………… Networked computer stations; dial-in access B …………………… Campus-wide area network C …………………… Computers and a laser printer in each classroom D …………………… Private directories for all students and staff E …………………… Mail for staff and students F …………………… Interactive distance learning stations G …………………… Instructional media center H …………………… Student stations I …………………… Resources accessible campus-wide via fiber optic network J …………………… On-line research services K …………………… Student-run stereo radio station L …………………… Telephone in every classroom M …………………… Voice mail for all staff N …………………… Electronic Bulletin Board available around the clock O …………………… T-Internet Access ( )计算机网站；拨号上网 ( )学生网站
The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps forty percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures are more prone to contract certain illnesses because of the food that is characteristic in these cultures. That food related to illness is not a new discovery. In 1945, government researchers realized that nitrates and nitrites, commonly used to preserve color in meats, and other food additives, caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful.The additives which we eat are not all so direct. Farmers often give penicillin to beef and poultry, and because of this, penicillin has been found in the milk of treated cows. Sometimes similar drugs are administered to animals not for medicinal purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA. has tried repeatedly to control these procedures, the practices continue. Why do farmers give drugs to their animals（）
One must live in the United States for five years in order to（）citizenship.
W: Excuse me. Would you mind if I use your phoneM: Sure. It’s on the table over there. What did the man mean（）
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