问题
选择题
The chief reason for the population growth isn’t so much a rise in birth rates ________ a fall in death rates as a result of improvements in medical care.
A.and
B.as
C.but
D.or
答案
答案:B
The chief reason for the population growth isn’t so much a rise in birth rates ________ a fall in death rates as a result of improvements in medical care.
A.and
B.as
C.but
D.or
答案:B