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

本題考查詞組辨析。think of想出；think over, think about均為考慮之意，根據句意“科學家們不得不想出新的方法來解決食物問題”，故選A。