英语六级

单选题

A．Exhaust emissions from cars and other vehicles.
B．The increasing population and the decreasing green vegetation.
C．The chemical reaction between methane and nitrous oxide.
D．The burning of fossil fuels and other human activity.

参考答案：D进入在线模考
According to the talk, what does carbon dioxide result from?  D。

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1

A．Because CO2 accounts for 65 percent of climate change.
B．Because the level of CO2 emissions has reached a record high.
C．Because the lifetime of CO2 is very long.
D．Because CO2 is a main greenhouse gas.

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2

A．The climate can be improved through concrete action.
B．The climate can be improved through political will.
C．The climate can be improved due to the Paris Climate agreement.
D．The climate can be improved as emissions reductions are legally binding.

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3

A．Mild cognitive impairment can be cured by weight lifting.
B．Increased muscle strength can improve brain function in older adults.
C．People with cognitive impairment cannot lead normal fives.
D．Cognitive training can improve brain function in those over the age of 55.

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