Lucy found a wild beehive inside a tree in northern Kenya and set up a recorder.Then she threw a stone into the beehive，which burst into life.Lucy and her assistant hid in their car until the angry bees had calmed down.Next，Lucy searched out elephant families in Samburu National Reserve in northern Kenya and put a speaker in a tree close to each family.

　　From a distance，Lucy switched on the pre－recorded sound of angry bees while at the same time recording the elephants with a video camera.Half the elephant groups left the area within ten seconds.Out of a total of 17 groups，only one group ignored the sound of the angry bees.Lucy reported that all the young elephants immediately ran to their mothers to hide under them.When Lucy played the sound of a waterfall (瀑布) instead of the angry bees to many of the same elephant families，the animals were undisturbed.Even after four minutes，most of the groups stayed in one place.

　　Lucy is now studying whether the elephants will continue to avoid the sound of angry bees after hearing it several times.She hasn’t tested enough groups yet to know，but her initial (最初的) results were promising enough to begin trials with farmers.She has now begun placing speakers in the fields to see if elephants are frightened away.

　　1．We know from the passage that elephants may be frightened of ________．

　　A．loud noises

　　B．some crops

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