[单项选择]A scientist interested in general knowledge about oxygen would probably call his approach ______.
A. applied science
B. chemical science
C. pure science
D. environmental science

[单项选择]A scientist interested in adding to our general knowledge about oxygen would probably call his approach ______.
A. applied science
B. agriculture science
C. pure science
D. environmental science

[单项选择]A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.
A. applied science
B. environmental science
C. pure science
D. agricultural science

[单项选择]Visitors interested in hearing about the museum exhibitions in great detail should take a guided tour of the ______.
A. container
B. facility
C. amendment
D. approach

[单项选择]According to the passage, how did knowledge about chemical processes increase before the seventeenth century


A. Philosophers devised theories about chemical properties.
B. A special symbolic language was developed.
C. Experience led workers to revise their techniques.
D. Experts shared their discoveries with the public.

[单项选择]Even with detailed knowledge about an area, geologists cannot easily locate stores of underground natural gas.


A. varieties
B. maps
C. supplies
D. shops

[单项选择]

Man has been storing up useful knowledge about himself and the universe at the rate which has been spiraling upward for 10,000 years.

　　The (21) took a sharp upward leap with the invention of writing, but even (22) it remained painfully slow for several centuries. The next great leap forward (23) knowledge acquisition did not occur (24) the invention of movable type in the 15th century by Gutenberg and others. (25) to 1500, by the most optimistic (26) Europe was producing books at a rate of 1000 titles per year. This means that it (27) a full century to produce a library of 100,000 titles. By 1950, four and a half (28) later, the rate had accelerated so sharply that Europe was producing 120,000 titles a year. (29) once took a century now took only ten months. By 1960, a (30) decade later, the rate had made another significant jump, (31) a century’s work could be finished in seven
A. therefore
B. hardly
C. accordingly
D. therefore