It is a basic ability for humans to tell more from less.Surprisingly，a number of animals（1）　　this ability too.They will（2）　　more of something.Horses，for example，will go for a group of three apples instead of two apples.

    This ability is（3）　 　to animals in lots of ways.It helps them（4）　　the larger group of friends.Many fishes，for example，join groups for（5）　　.If a predator （掠食动物）comes，a fish in a group of 40 is less possible to become lunch than a fish in a group of 10.So if a fish has a choice between two groups，it's safer to join the（6）　 　one.A sense of number even helps keep the（7）　　.For example，a monkey group will avoid fights with other groups when they find their（8）　 　is not an advantage.

    Also，the ability to do simple（9）　　is a sure thing for some animals.They（10）　　the difference between one，two，and three.

    Some others can count much higher than three.

（1）A.have	B.miss	C.doubt	D.hate
（2）A.grow	B.cook	C.pick	D.leave
（3）A.fresh	B.useful	C.correct	D.direct
（4）A.hide	B.beat	C.push	D.find
（5）A.safety	B.holiday	C.discussion	D.exercise
（6）A.faster	B.larger	C.busier	D.quieter
（7）A.secret	B.interest	C.peace	D.record
（8）A.age	B.number	C.time	D.speed
（9）A.counting	B.jumping	C.dancing	D.swimming
（10）A.mix	B.like	C.ask	D.know