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As of late 1980s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would
As of late 1980s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would
admin
2021-09-28
20
问题
As of late 1980s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would help or hurt a warming globe. Some studies suggested that a four percent increase in stratocumulus clouds over the ocean could compensate for a doubling in atmospheric carbon dioxide, preventing a potentially disastrous planetwide temperature increase. On the other hand, an increase in cirrus clouds could increase global warming.
That clouds represented the weakest element in climate models was illustrated by a study of fourteen such models. Comparing climate forecasts for a world with double the current amount of carbon dioxide, researchers found that the models agreed quite well if clouds were not included. But when clouds were incorporated, a wide range of forecasts was produced. With such discrepancies plaguing the models, scientists could not easily predict how quickly the world’s climate would change, nor could they tell which regions would face dustier droughts or deadlier monsoons.
It can be inferred that one reason the fourteen models described in the passage failed to agree was that
选项
A、they failed to incorporate the most up-to-date information about the effect of clouds on climate
B、they were based on faulty information about factors other than clouds that affect climate
C、they were based on different assumptions about the overall effects of clouds on climate
D、their originators disagreed about the kinds of forecasts the models should provide
E、their originators disagreed about the factors other than clouds that should be included in the models
答案
C
解析
根据第一段二三两句提供的信息,当我们能确定云的种类的时候,云对地球气候的影响是可以确定的,因此十四个模型的结论不统一的原因是不同模型关于云所能产生的影响的假设是不同的。有的模型认为云可以降温,有的模型认为云可以增温,大家的观点都不统一。因此模型的结果也是不统一的,故选项C正确。
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