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 eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, 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 living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical 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.

A:They preserve flavor in packaged foods. B:They preserve the color of meats. C:They are the objects of research. D:They cause the animals to become fatter.

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 40 percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures ate more prone to get certain illnesses because of the food that is characteristic in these cultures. That food is 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 that 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.

A:They preserve flavor in packaged foods. B:They preserve the color of meats. C:They are the objects of research. D:They cause the animals to become fatter.

The National Park Service America’s national parks are like old friends. You may not seethem for years at a time, but just knowing they’re out there makes you feelbetter. Hearing the names of these famous old friends-Yosemite, Yellowstone,Grand Canyon - revives memories ofvisits past and promotes dreams of those still to come. From Acadia to Zion, 369 national parks are part of a continuallyevolving system. Ancient fossil beds, Revolutionary War battlefields,magnificent mountain ranges, and monuments to heroic men and women who moldedthis country are all a part of our National Park System (NPS). The care and preservationfor future generations of these special places is entrusted to the NationalPark Service. Uniformed Rangers, the most visible representatives of theService, not only offer park visitors a friendly wave, a helpful answer, or athought-provoking history lesson, but also are skilled rescuers, firefighters,and dedicated resource protection professionals. The National Park Service ranksalso include architects, historians, archaeologists, biologists, and a host ofother experts who preserve and protect everything from George Washington’steeth to Thomas Edison’s wax recordings. Modern society has brought the National Park Service both massivechalienges and enormous opportunities. Satellite and computer technologies areexpanding the educational possibilities of a national park beyond it’s physicalboundaries. Cities struggling to revive their urban cores are turning to the ParkService for expert assistance to preserve their cultural heritage, createpocket parks and green spaces, and re-energize local economies. Growingcommunities thirsty for recreational outlets are also working with the NPS toturn abandoned railroad tracks into bike and biking trails, as well as giving unusedfederal property new life as recreation centers. To help meet these challenges and take advantage of theseopportunities, the National Park Service has formed partnerships - some datingback 100 years, some only months old -with other agencies, state and local governments, corporations, American Indiantribes and Alaska Natives, Park Friends groups, cooperating associations,private organizations, community groups and individuals who share the NationalPark ethic. National Park Week 1996 is a celebration of these partnerships. The National Park Service does all of the following EXCEPT

A:offering help to visitors. B:molding the Nation. C:keeping people better informed of the National Park System. D:helping preserve the cultural heritage.

使用ReDim Preserve语句，可以( )。

A:改变数组最后一维的大小 B:改变数组第一维的大小 C:改变数组所有维的大小 D:改变数组维数和所有维的大小

使用ReDim Preserve语句，可以( )。

A:改变数组最后一维的大小 B:改变数组第一维的大小 C:改变数组所有维的大小 D:改变数组维数和所有维的大小

使用ReDim Preserve语句，可以( )。

A:改变数组最后一维的大小 B:改变数组第一维的大小 C:改变数组所有维的大小 D:改变数组维数和所有维的大小

使用ReDim Preserve语句，可以( )。

A:改变数组最后一维的大小 B:改变数组第一维的大小 C:改变数组所有维的大小 D:改变数组维数和所有维的大小