单选题
Earth scientists have come to understand that climate ______.
A、
is going through a fundamental change
B、
has been getting warmer for 10,000 years
C、
will eventually change from hot to cold
D、
has gone through periodical changes
【正确答案】
D
【答案解析】
[解析] 该题针对第二段的主旨：科学家通过研究过去的气候变化对人类生存的影响得出结论——地质因素和气象因素的共同作用导致地球气候数亿年来由热到冷、由湿润到干燥反复变化(最后一句)。D项所述(地球气候经历了周期性变化)与此一致。
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