1.Hares and Rabbits
One of the gentlest of all animals is the hare.When you consider how mild this animal is，you might wonder how it can survive in a world full of enemies.But then you’ve also probably noticed its strong hind(后面的)legs.Those legs give it plenty of speed.And you know how rapidly hares and rabbits breed(繁殖).That’s another reason why they manage to survive.
Hares and rabbits have long，sharp front teeth.Their hind legs are longer than their front legs so that they run faster uphill than downhill.When they are hunted，they use tricks such as taking huge leaps to break the smell or signal danger to each other by hitting the ground with their hind feet.Hares and rabbits are purely vegetarians(素食者).They can live very well on the inner bark of trees.
There are many differences between hares and rabbits.Hares are larger，and their feet and ears are longer.Hares do not dig holes or live in groups，as do rabbits.Hares are born open-eyed and with thick fur，while rabbits are born blind and hairless.
North America is the home of many different types of hares.One of the best known is the jack hare，a large hare with very long ears.Jacks are so fast that they can sometimes make a leap of six meters.
The March hare，whom we know from Alice in Wonderland，is a common European hare.In March，they are always busy in mating，thus acquiring its name.
Unlike hares，rabbits are social animals，living together in holes.A rabbit may mate when it is six months old and its young are born within a month.So if the rabbit has no natural enemies，it can become quite a pest.
1-1.People are curious about the survival of the hare because________.
their legs are not strong enough
their growth is not fast enough
they are too gentle
they run too slow
【答案】C
【解析】事实细节题。由第一段第一、二句可知，野兔是最温顺的动物之一，当你在想这个动物有多温顺时，你可能想知道在一个满是敌人的世界上它是怎样存活的。因为野兔很温顺，故人们对它们能够幸存很好奇。故选C。
1-2.Hares and rabbits use tricks when they________.
run uphill
are hunted
signal danger
take huge leaps
【答案】B
【解析】事实细节题。由第二段第三句可知，当野兔和家兔遭到捕猎时，它们都会使用伎俩。故选B。
1-3.Compared with hares，rabbits________.
have longer feet
have thicker fur
are born open-eyed
like to live in groups
【答案】D
【解析】事实细节题。由第三段可知，野兔和家兔有很多不同之处，野兔较大，它们的脚和耳朵都较长；野兔不会挖洞，也不群居生活，而家兔会挖洞，过着群居生活；野兔出生时眼睛是睁开的，身上毛很厚，而家兔出生时眼睛是闭着的，浑身无毛。故选D。
1-4.Many people get to know the March hare from the fact that it________.
has long ears and legs
digs a lot of holes in March
can make a leap of six meters
appears in Alice in Wonderland
【答案】D
【解析】事实细节题。由倒数第二段第一句可知，人们都知道三月兔出现在《爱丽丝梦游仙境》中。故选D。
1-5.Rabbits’natural enemies prevent them from________.
becoming a big trouble
breeding when young
living in holes
becoming social animals
【答案】A
【解析】推理判断题。由最后一段最后一句可知，如果家兔没有天敌的话，它就会泛滥成灾了。所以正是家兔的天敌阻止它们成为大麻烦。故选A。