It is already well understood        causes the global warming.
A．whatB．whenC．thatD．how
A               
             
試題分析：考查連詞。句意 這讓我們很好的了解， 什么導(dǎo)致了全球變暖。It做形式主語(yǔ)，真正的主語(yǔ)是后面的主語(yǔ)從句      causes the global warming ，主語(yǔ)從句缺少主語(yǔ)用what“什么”引導(dǎo)， 所以選A項(xiàng)。       
考點(diǎn) : 考查連詞
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