2007年职称英语理工类A级全真模拟题及答案(3)

41 According to the passage, a greenhouse is built to

A keep the plants warm.

B prevent air pollution.

C stop the greenhouse effect.

D produce useful gases.

42 Without the greenhouse gases, the earth would

A become warmer.

B be much colder.

C move more slowly.

D move quickly.

43 A major cause of the increase in the greenhouse gases is

A the burning of trees and crops.

B the building of many greenhouses.

C the burning of large quantities Of coal and oil.

D the flooding of large areas of the world.

44 According to the passage, chlorofluorocarbon gases differ from carbon dioxide in that

A they are more useful.

B they are much heavier.

C they are more efficient in making the'''' world colder.

D they are more effective in catching the heat from the sun.

45 A small increase in the earth''''s temperature may bring about

A a decline in agriculture.

B a drop of the sea level.

C the death of all animals.

D a delay in the greenhouse effect.