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单项选择题

A．Learn to make notepads from unused sides of paper.B．C……


Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
What can we do to avoid the waste of paper



A．Learn to make notepads from unused sides of paper.
B．Cut down on paper consumption.
C．Teach children not to litter.
D．Stop using paper towels.
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单项选择题It can be concluded that a concentration of carbon dioxide in the atmosphere would ______ .

A．prevent the sun’ s rays from reaching the earth’ s surface
B．mean a warming up in the Arctic
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth’ s surface

单项选择题We can infer from the first two paragraphs that the industrialists disregard environmental protection chiefly because ______ .

A．they are unaware of the consequences of what they are doing
B．they are reluctant to sacrifice their own economic interests
C．time has not yet come for them to put due emphasis on it
D．it is difficult for them to take effective measures

填空题What forms flood plain

单项选择题23（）

A．highly
B．very
C．extremely
D．quite

填空题Legislators have made ______ the basis of many noise reducing programs.