更多"Cutting carbon dioxide emission by "的相关试题:
[单项选择]Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.
A. slots
B. hoses
C. pores
D. sponges
[单项选择]Why researchers put trees in extra carbon dioxide in the first study
A. To learn whether trees can still absorb carbon dioxide under extreme conditions.
B. To get more oxygen from these trees.
C. To evaluate the maximum carbon dioxide that trees can absorb.
D. To see the growth rate of these trees.
[单项选择]A concentration of carbon dioxide in the atmosphere would______.
[单项选择]
In the atmosphere, carbon dioxide acts rather like a one-way mirror -- the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping. According to a weather expert’s prediction, the atmosphere will be 3~C warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the earth’s chief food-growing zones. In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of
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]According to the passage, carbon dioxide serves which of the following functions for fire ants
A. (It protects the queen
B. ( It attracts other ant species
C. ( It informs workers of possible danger
D. ( It encourages the ants to gather together
[单项选择]The process by which carbon dioxide and oxygen are transferred does not depend on_______.
A. the presence of nitrogen in the blood
B. the muscles of the thoracic cavity
C. the flow of blood
D. the moisture in the air sac linings
[单项选择]The concentration of carbon dioxide is caused by_______.
A. the heat accumulated in the atmosphere
B. the burning of coal
C. the wide use of renewable energy
D. the destruction of the tropical rain forest
[单项选择]If the percentage of carbon dioxide in the air continues to increase at current rates ______.
A. average daily temperatures worldwide could increase considerably
B. some sea level islands could be threatened by flooding
C. all coastal regions throughout the world could be at serious risk
D. all of the above
[单项选择]Townes's early work with stimulate emission was done with microwaves because______.
A. he was not concerned with amplification
B. his partner Schawlow had already begun work on the laser
C. it was easier to work with longer wavelengths
D. the laser had already been developed
[单项选择]Cutting taxes can lower investment through its impact on interest rates. This is an example of the: ( )
A. Income effect.
B. Accelerator effect.
C. Crowding out effect.
D. Multiplier effect.
[单项选择]Residents were cutting their lawns, washing their cars and otherwise ______ a pleasant, sunny day.
A. driving away
B. chasing away
C. taking away
D. idling away
[单项选择]It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.