问题
选择题
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
答案
答案：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。