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19.How did the water tap change Lilian's life
A.She got a job to sell water.
B.She spent more money on water.
C.She moved to a new home near the tap.
D.She made her dream of becoming rich come true.
20.What is the best title of the passage
A.The importance of clean water
B.The dangers of drinking dirty water
C.Lilian's dream of starting a business
D.Clean water changes lives in Rwanda
c
Can trees talk Some scientists find that trees can really"talk"!
Some trees use chemicals(化学物质)to talk.When insects attack them,hey
gives out chemicals from the leaves.This is like a call for help,"Tm being attacked!"
Some of these chemicals drive insects away.Others can call birds to come to kill the
insects.Scientists hope to learn more about this,so that we can use it to keep insects
away from crops like rice.
More surprisingly,trees also use sound to talk.People can't hear these sounds,but
trees are making them.Some plants make noises with their roots.Some trees make
noises when there is not enough water.
Most surprisingly of all,trees have an"Internet"to give out and get information in
a big forest..Scientists call it the“Wood Wide Web”(树联网).The fungi(真菌)
underground help build up the"Wood Wide Web"among the roots of different trees.It
is just like the Internet we use.Using the "Wood Wide Web",trees can share
information and even food with each other.However,it may also be harmful.Some
trees may use it to take too much food from others,or give out chemicals to hurt other
plants.Perhaps one day scientists will leam how to build a"Great Wall"to help stop
these.
Trees talk to each other in different ways.Now,scientists are learning more about
these ways and maybe one day we will be able to'talk"with trees ourselves.
21.What are the purposes of the chemicals released by trees
①To drive insects away
2To attract more insects to the leaves
3 To help the trees grow faster To call birds that will eat the attacking insects
A.①②
B.①④
c.②③
D.②④
22.How many ways does the passage show trees can"talk"
A.One.
B.Two.
C.Three.
D.Four.
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