Question

---In recent years,______problem of global warming had been very serious.
---That is right. People are facing______number of natural disasters now.

1. A.
   \; a
2. B.
   \ ;the
3. C.
   the; a
4. D.
   a ;a

Answer 1

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。