----- In recent years,___ problem of global warning has been very serious.
------That’s right. People are facing ____ number of natural disasters now.
A. 不填; B. a; the C. the; a D. a; a
----- In recent years,___ problem of global warning has been very serious.
------That’s right. People are facing ____ number of natural disasters now.
A. 不填; B. a; the C. the; a D. a; a
C
考查冠词。全球变暖的问题是特指，a number of，许多，为固定表达。