从动物行为获得的途径来看，“谈虎色变”、“杯弓蛇影”属于______行为；“几处
题型：填空题
问题：
从动物行为获得的途径来看，“谈虎色变”、“杯弓蛇影”属于______行为；“几处早莺争暖树”，“谁家春燕啄春泥”属于______行为．
题型：填空题
Cans of tennis balls were purchased for the tournament at a cost of $1. 90 per can. Only
of the cans were used for the tournament, so the 24 unused cans were returned for a refund. What was the cost of the cans of tennis balls used for the tournament