阅读理解：
阅读下面短文，从所给四个选项中，选出最佳答案。
Can trees talk? Yes——but not in
words． Scientists have reason to believe that trees do communicate (互通信息) with each
other． Not long ago, resear- chers learned some surprising
things． First a willow tree(柳树)attacked in the woods by caterpillars(毛毛虫)changed the chemistry of its leaves and made them taste so terrible that the caterpillars got tired of the leaves and stopped eating
them． Then even more astonishing, the tree sent out a special vapour — a signal causing its neighbours to change the chemistry of their own leaves and make them less
tasty．
Communication, of course, doesn't need to be always in
words． We can talk to each other by smiling, raising our shoulders and moving our
hands． We know that birds and animals use a whole vocabulary of songs, sounds, and
movements． Bees dance their signals, flying in certain patterns that tell other bees where to find nectar(花蜜)for
honey． So why shouldn't trees have ways of sending messages?
1． When attacked, a willow tree will protect itself
by________．
[ ]
A． changing its leaves’chemistry
B． changing its leaves’colour
C． talking to caterpillars
D． sending a special vapour
2． From the passage we know that
catrpillars________．
[ ]
A． like willow trees
B． enjoy eating fallen leaves
C． feed on willow tree leaves
D． could communicate with willow trees
3． Caterpillars will stop eating willow tree leaves
which________．
[ ]
A． have a chemical change and become tasteless
B． have a pleasant taste
C． are being attacked
D． are communicating
4． According to the passage, how do willow trees communicate with each other?
[ ]
A． They talk in
words．
B． They send out a special
vapour．
C． They wave their leaves．
D． They make special
sounds．
5． According to the passage, bees communicate with each other
by______．
[ ]
A． talking
B． making unusual sounds
C． singing songs
D． fly in certain patterns
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