Question

While working in the countryside, the students         a great deal of knowledge on plant life.

A．looked up

B．picked up

C．put up

D．called up

Answer 1

B

词义辨析。looked up抬头看，查找；picked up 学会；put up挂起，张贴；called up给某人打电话。句意：在农村工作时，学生们选学会了大量关于植物的知识。所以选B。