II.完形填空( 10分)
阅读下面短文，从短文后每小题所给的A.B.C.D四个选项中选出最佳选项。 (共 10小题，每小题 1分 )
Lucy Lake is a large, cold lake with many different plants and animals living in and around her. In the past, the plants and animals had enough food and clean water to keep them ___21____. But one day, Lucy Lake and her friends didn't feel very well. All the plants and animals of the forest gathered together to ___22___ the problem.
"Why are we sick?" asked Frannie Frog. "Who is doing this to us?" asked Sammy Spruce. “What can we do?” asked Lucy Lake. No one had any___23____. Just then, two hikers (徒步旅行者) ___24___. They told the hikers about their problems. "We are hungry," "We're tired and ___25___." Our babies are sick," the plants and animals said. "Can you help us?" they____26___ asked. The hikers both said, “Yes.” One hiker said, “It's acid rain (酸雨). It comes from chemicals in the air or pollution. Pollution comes from power plants and cars and trucks people drive. Pollution also___27___acid rain.” “So, even though I don't want to, I help pollution ___28___a long distance through the air!” said Wendy Wind. “And whatever it is in the air, it falls from the sky in my raindrops!” cried Raphael Rain. "If you can help us think of ways to ___29____ the problem we will deliver (递送) a message to others about how they can clean up our environment," one animal said. With the help of the two___30___, the plants and animals made a list of ideas for saving Lucy Lake and themselves.
