阅读下面短文，并根据文章后的题目进行简答。

　　Elephants don't forget－at least, female(雌性的)elephants don't．Elephant families are matriarchal．And the social knowledge gained by the oldest females is the key to a family group's survival(生存), according to a study published in April by Karen McComb, a biologist at Sussex University in England．

　　Elephants announce their presence by making a deep, long sound, a practice referred to(涉及)as contact calling(联络呼叫), An unfamiliar call may mean that an elephant from outside the family group is nearby．A stranger can cause trouble, interrupting feeding or disturbing(打扰)the young．So an elephant matriarch signals the family to gather around her; then they all lift their trunks in the air to smell the unfamiliar caller．False alarms can disturb the group and take time and energy away from feeding, so survival may depend in part on getting it right．

　　Working with Cynthia Moss, who founded the Amboseli Elephant Research Project in Kenya 30 years ago, McComb tested the social knowledge of 21 Amboseli elephant families with matriarchs 27 to 67 years old．She played recordings of contact calls to each family and found that the oldest matriarchs were much better at picking out unfamiliar calls．In fact, a group with a matriarch in her fifties was several thousand times more likely to form into a group upon hearing an unfamiliar contact call than when hearing a familiar call．However, families with younger matriarchs were less than twice as likely to gather together upon hearing an unfamiliar contact call as compared with a familiar call．And they gathered together a lot．Moreover, the social knowledge of older matriarchs translated into favourable results：Families with older matriarchs produced more baby elephants in each female-reproductive year．

　　This finding shows how difficult it is to protect the oldest members of elephant families．As elephants age, they continue to grow larger, as do their much wanted tusks(象牙)．So the older－and wiser－a matriarch is, the greater the chance she will be killed．About 800,000 elephants have been killed by people in the past 200 years．

1．When do elephants form into a group?

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2．What is called contact calling?(Please answer within 20 Words)

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3．What does the word “matriarch”mean?

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4．What is the influnce of a stranger on a elephant group?(Please answer within 20 dords)

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5．Translate the underlined sentence in the last paragraph into Chinese．

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