----In recent years, _____problem of global warming has become very serious.
----That’s right. People are facing _____diversity of natural disasters now.
A. /, a B. a, the C. the, a D. a, a
----In recent years, _____problem of global warming has become very serious.
----That’s right. People are facing _____diversity of natural disasters now.
A. /, a B. a, the C. the, a D. a, a
C