The world’s population is getting larger and larger so scientists will have to new ways

问题补充：

The world’s population is getting larger and larger, so scientists will have to new ways to solve food problem.

A. catch up with

B. keep up with

C. come up with

D. make up with

答案：

A. catch up with

B. keep up with

(答案→)C. come up with

D. make up with

解析：词义辨析。catch up with跟上；keep up with赶上；come up with想出；make up with与……和解。句意：世界人口越来越多，所以科学家们不得不想出新方法来解决食物问题。所以选C。