单项选择题


Questions 17-20 are based on the following monologue. You now have 20 seconds to read Questions 17-20.
Which of the following does not contribute to Toronto’s healthy economy

A．A large local market.
B．Tremendous opportunities for manufacturing and development.
C．The diversified industrial base.
D．Abundant capital.
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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
What does one have to be if he wants to make himself creative according to the author
A．He should try to be as creative as possible.
B．He may set up a problem and then try to conceive all the possible solutions to it.
C．He should study all the techniques mentioned in the passage and try to use them.
D．He should play a different role from the one he plays now.
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