[单项选择]

建在海拔2500m城市的一座大型计算机房，建筑面积为600m²，高度为6m，其中地面架空的电缆层高度为1m，吊顶高度为1.5m。常年空调温度为20℃。空间非可燃固体物质的实际体积为100m³。采用七氟丙烷灭火系统进行消防，在不考虑其他因素的情况下，该系统防护区的灭火设计用量为（）。

A. 2916.30kg
B. 1630.91kg
C. 1677.51kg
D. 3062.12kg

As one of the 20th century’s most skillful political leaders, Franklin Delano Roosevelt was elected for an unprecedented four terms. His New Deal Program, in response to the Great Depression, utilized the federal government as an instrument of social and economic change in contrast to its traditionally passive role. He said in his inaugural address(就职演说), "The only thing we have to fear is fear itself." And he helped American people regain confidence in themselves. Then in World War II, he led the Allies in their defeat of the Axis Powers.
Born in Hyde Park, New York, on January 30, 1882, he was the only child of James Roosevelt and Sara Delano Roosevelt. His father was a cousin of Theodore Roosevelt, the 26th president of the .U.S. After graduation from Harvard University in 1904, Roosevelt attended Columbia University Law School without taking a degree and was admitted to the New York State Bar (律师业) in 1907. In 1905, he married a distant cousin, Eleanor
A. Roosevelt’s term as President was the longest in American history.
B. His father’s cousin was formerly the President of the United States.
C. He graduated from Columbia University Law School without a degree.
D. Theodore Roosevelt was ever Vice President in the history of the United States.

There are advantages and disadvantages to 21 Asian and Western educational method. For example, one advantage 22 the education in Japan is that students there learn much more math and science 23 American students. They also study more hours each day than Americans 24 . The study is difficult, but it 25 students for a society that values discipline (纪律) and self-control. There is, however, a disadvantage. Memorization is an important learning method in Japanese schools, 26 many students say that after an exam, they forget much of the information that they have memorized.
The advantage to the education in North America, 27 the other hand, is that students learn to think by themselves. The system prepares them for a society that values 28 ideas. There is, however, a disadvantage. When students graduate from high school, they haven’t memorized 29 many basic rules and facts as students in other countries 3
A. provides
B. gets
C. prepares
D. does