单选题 阅读下面短文，请从短文后所给各题的4个选项(A、B、C、D)中选出1个最佳选项。
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 sdivong 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 divicks 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 divees.
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 rabbits may mate when it is six months old and its young are born within a month.So if the rabbit has no natural enemy, it can become quite a pest.People are curious about the survival of the hare because ______.