Question

--The world's population is getting larger and larger. It's a serious problem.
--Yes. Scientists will have to        new ways        food problem.
A. think of, to solve
B. think over, of solve
C. think about, about solving

Answer 1

A

本题考查词组辨析。think of想出；think over, think about均为考虑之意，根据句意“科学家们不得不想出新的方法来解决食物问题”，故选A。