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---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 ;a
C

试题分析:考查冠词。第一空使用the特指全球变暖的问题;第二空是固定词组a number of许多,大量;修饰可数名词复数形式。故C正确。
考点:考查冠词
点评:冠词的考查要注意the表示特指;a/an表示泛指,同时要注意构成的固定搭配和一些不要使用冠词的情况。
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