The world’s population hit 7 billion on Monday among celebrations and concerns about _______ the growing number of people will affect the earth’s resources.
A.why B.how C.whether D.what正确答案B
The world’s population hit 7 billion on Monday among celebrations and concerns about _______ the growing number of people will affect the earth’s resources.
A.why B.how C.whether D.what正确答案B
