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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Male lions are rather reserved about expending their energy in hunting. More than three-quarters of kills are made by lionesses. Setting off (1) dusk on a hunt, the lionesses are in (2) , tensely s...
A.
problem
B.
business
C.
matter
D.
doubt
【单选题】定义：①敬态：形成集群生活的动物，日常对集群的其他个体(包括配偶者)所表现的回避攻击而保持友好的行为。②食草作用：捕食作用的一种特殊类型。植物虽不能主动逃脱食草动物，但却可通过某些适应方式以防止被食。③相克作用：植物利用其代谢产物来影响其他植物。 典型例证：(1)某些植物叶子中的单宁含量占其干重的60%，味道又苦又涩(2)胡桃树叶片分泌的化学物质，会抑制树下其他植物的生长(3)獴是毒蛇的天敌，它们...
A.
0个
B.
1个
C.
2个
D.
3个
【单选题】Sporting activities are essentially modified forms of hunting behavior．Viewed biologically, the modern foot-bailer is in reality a member of a hunting group．His killing weapon has turned into a harmle...
A.
are forms of biological development
B.
have actually developed from hunting
C.
are essential forms of taming the prey
D.
have changed the ways of hunting