22. With the population explosion, scientists will have to _________ new methods of increasing the world's food supply.
A. lead to
B. carry out
C. come up with
D. stick to
(责任编辑:admin) |
22. With the population explosion, scientists will have to _________ new methods of increasing the world's food supply.
A. lead to
B. carry out
C. come up with
D. stick to
(责任编辑:admin) |