[单项选择]在Internet上，计算机之间的文件传输使用的协议是（）。
A. http
B. ftp
C. telnet
D. News

A bite of a cookie containing peanuts could cause the airway to constrict fatally. Sharing a toy with another child who had earlier eaten a peanut butter and jelly sandwich could raise a case of hives. A peanut butter cup dropped in a Halloween bag could contaminate the rest of the treats, posing an unknown risk.
These are the scenarios that "make your bone marrow turn cold" according to L. Val Giddings, vice president for food and agriculture of the Biotechnology Industry Organization. Besides representing the policy interests of food biotech companies in Washington, D. C., Giddings is the father of a four-year-old boy with a severe peanut allergy. Peanuts are only one of the most allergenic foods; estimates of the number of people who experience a reaction to the beans hover around 2 percent of the population.
Giddings says that peanuts are only one of several foods that biotechnologists are altering genetically in an attempt to eliminate the proteins
A. Genetically modified foods have been supervised by the authority
B. Genetically modified foods have proved to be safe
C. The nonengineered foods absolutely can be contaminated by the engineered foods
D. The engineered foods are immediately profitable for the food companies

In earlier centuries, nursing care was usually provided by volunteers who had little or no training--most commonly men and women of various religious orders. Toward the end of the 18th century nursing was considered an unsuitable occupation for "proper" young women, undoubtedly due to the fact that hospitals in those days were dirty places where patients usually died. As a result, those who provided nursing care were commonly persons who could not find work elsewhere.
Modern nursing began in the mid-19th century with the appearance of the Nightingale training schools for nurses. In the United States, the Spanish-American War and, later, World War I established the need for more nurses in both military and civilian life. As a result, nursing schools increased their enrollments, and several new programs were developed. In 1920 a study recommended that schools of nursing be independent of hospitals and that students no longer be exploited as cheap labor. Fo
A. high
B. intermediate
C. normal
D. low