单项选择题

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
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单项选择题
Whatever the causes, the English by the end of the year 2050 will have been more widely spoken and written than any other language ______.
A. ever was


B. had ever been
C. would ever be


D. has ever been
单项选择题
By the first decade of the 21st century, international commercial air traffic is expected ______. vastly beyond today’s levels.
A. to have extended

B. being extended
C. to be extending


D. having been extended
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