更多"Our research has focused on a drug "的相关试题:
[单项选择]Our research has focused on a drug which is so （ ） as to be able to change brain chemistry.
A. powerful
B. influential
C. monstrous
D. vigorous
[填空题]
A. Recent archaeological research has focused on a phenomenon barely noticed before: extensive patches of rich black soil found along the banks and on terraces above all major rivers in the Amazon. Some cover an area of many acres and are up to 6 feet deep. They are thought to have formed over many centuries as the accumulated product of organic remains left by native settlements. These soils are usually filled with fragments of busted ceramics and are now being studied for clues to the rise of tropical forest civilizations in the Amazon Basin. Local farmers regard the black soils as a "gift from the past" because they are naturally fertile and have the ability to support a wide range of crops.
B. Secondly, there is a truly impressive diversity of languages, with several hundred distinct tongues and dialects. This verbal diversity must have evolved over thousands of years and implies an occupation of the Amazon basin for at least 14,000 years, a figure support
[填空题]The U.S. Food and Drug Administration has acted against similar contamination incidents like that involving SV40 out of fear of a wider spread of AIDS.
[填空题]Every drug has some side effects.
[单项选择]Of all the varieties of music which fill our concert halls, theaters, and nightclubs, only jazz is native American music. Symphonies and concertos, the ancestors of movie and television scores as well as of "serious" or "legitimate" electronic music, were first composed in Germany. Musical comedies descended from opera, which was first performed in Italy. And our ever-popular nightclub singers are the musical heirs of the French singers of chansons.
The one form of music which did not originate in Europe and which is popular today worldwide is jazz. Jazz was born in New Orleans, the child of the Blacks. It drew on the rhythms as well as the emotionalism of the African music of the Black ancestors, which had been transformed into ragtime and the blues. Improvisation was an indispensable element. Musicians were permitted, in solo performance, plenty of freedom to play in whatever variations just as their creative mood happened to lead them along. But during the Swing Era (1930s--1
A. The Origin and Development of Jazz.
B. The Popularity of the Rock Music.
C. The Development of Music from Jazz to Rock.
D. The Social Function of Musi
[填空题]Nothing in recent years has so changed the economy of the United States as the development of the supermarket.{{U}} (11) {{/U}}, people bought their food in small grocery stores, generally{{U}} (12) {{/U}}on a nearby comer. Now, almost everyone shops in large supermarkets. The small independent grocer has{{U}} (13) {{/U}}disappeared from the American{{U}} (14) {{/U}}.
When a supermarket is{{U}} (15) {{/U}}in a certain section of a city, other smaller stores rise up around it almost{{U}} (16) {{/U}}The entire group of stores becomes what is{{U}} (17) {{/U}}. as a shopping center. The average supermarket covers about 35,000 square feet of shopping area.{{U}} (18) {{/U}}. Six out of every ten American shoppers drive to the supermarket.
{{U}} (19) {{/U}}.On average she spends from one hour to two hours there each week. Psychologists say that women don’t go to the supermarket just to buy food, {{U}} (20) {{/U}}.In the supermarket she feels that she is part of the
