UNIT 7 – WORLD POPULATION CHOOSE THE WORD THAT HAS THE UNDERLINED PART...
23. Scientists say that the main reason __________ population explosion is an increase in birth rates.
a. of
b. to
c. for
d. in
23. Scientists say that the main reason __________ population explosion is an increase in birth rates.
a. of
b. to
c. for
d. in