单项选择题

Why were only the months of January and July chosen to be coded

A．To make the task more idealistic.
B．These two months were appropriate representatives of the year.
C．These months gave more opportunity for visitation.
D．To make the task more realisti
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单项选择题
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
单项选择题
According to the information contained in the article, tropical deforestation______.
A．will continue relentlessly and cannot be prevented
B．may have critical consequences for tile survival of mankind
C．is not a really serious problem and reports have been widely exaggerated
D．is necessary for the economic development of non-industrialized countries
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