D．unless

　　18．A.linked

　　B．combined

　　C．provided

　　D．diagnosed

　　19．A.lives

　　B．tomorrows

　　C．lessons

　　D．opportunities

　　20．A.surely

　　B．almost

　　C．ever

　　D．never

　　三、阅读理解

　　It was a village in India.The people were poor.However，they were not unhappy.After all，their forefathers had lived in the same way for centuries.

　　Then one day，some visitors from the city arrived.They told the villagers there were some people elsewhere who liked to eat frog’s legs.However，they did not have enough frogs of their own，and so they wanted to buy frogs from other places.

　　This seemed like money for nothing.There were millions of frogs in the fields around，and they were no use to the villagers.All they had to do was catch them.Agreement was reached，and the children were sent into the fields to catch frogs.Every week a truck arrived to collect the catch and hand over the money.For the first time，the people were able to dream of a better future.But the dream didn’t last long.

　　The change was hardly noticed at first，but it seemed as if the crops were not doing so well.More worrying was that the children fell ill more often，and，there seemed to be more insects around lately.

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