While working in the countryside, the students         a great deal of knowledge on plant life.
A．looked upB．picked upC．put upD．called up
B
詞義辨析。looked up抬頭看，查找；picked up 學會；put up掛起，張貼；called up給某人打電話。句意：在農(nóng)村工作時，學生們選學會了大量關于植物的知識。所以選B。
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