Scientists from different countries are trying to a good way to solve the energy problem.A

问题补充：

Scientists from different countries are trying to a good way to solve the energy problem.

A. keep up with

B. come up with

C. catch up with

D. meet up with

答案：

A. keep up with

(答案→)B. come up with

C. catch up with

D. meet up with

解析：句意：来自于不同国家的科学家正在努力相处解决能源问题的好方法。A与……保持齐头并进B想出C抓住D碰见。根据句意选B。