---In recent years, _____ problem of global warming has been very serious.
---That’s right. People are facing ____ number of natural disasters now.
A. the; a
B. a; the
C. a; a
D. the; the
A
考查冠詞的用法。第一空是特指全球變暖的問題，所以用the,第二空為固定短語：a number of 許多，后用可數(shù)名詞復(fù)數(shù)。the number of什么的數(shù)量，句意：在最近幾年，全球變暖的為題已經(jīng)很嚴(yán)重了。是的，人們正在面臨許多自然災(zāi)難。所以選A。
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