---In recent years,      problem of global warming had been very serious.
   ---That is right. People are facing     number of natural disasters now.
A．\; aB．\ ;theC．the; aD．a(chǎn) ;a
C

試題分析：考查冠詞。第一空使用the特指全球變暖的問題；第二空是固定詞組a number of許多，大量；修飾可數(shù)名詞復(fù)數(shù)形式。故C正確。
考點(diǎn)：考查冠詞
點(diǎn)評：冠詞的考查要注意the表示特指；a/an表示泛指，同時(shí)要注意構(gòu)成的固定搭配和一些不要使用冠詞的情況。
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