摘要：A.surprise B. disappointment C. delight D. satisfaction (20) Chad performs his 24-foot aluminum (铝)boat past willow young trees that stick out of the waters of the Mississippi River. 1 dances off maples, their branches heavy with 2 spring leaves. But a 3 inspection discloses trouble behind the beautiful sight. Rubbish is 4 in a logjam(河道内运完木材所剩的木头) and hangs from the trees branches. 5 the next three hours Chad and his team pull plastic bags, tanks, bottles and 6 bowling pins out of the water. Then they 7 for a picnic table caught in the trees. Welcome to the Mississippi River Beautification & Restoration Project, began in 1997 as Chads one-man 8 to pick up rubbish along a 400-mile stretch of the 2340-mile river. That year, often working 9 , the 22-year-old cleaned 150 miles of shoreline. At first the project appeared 10 and useless. But Chad tried his best to find 11 , and with their backing, he soon had a new boat and a five-man team---the Boom Crane Crew. Last year alone the crew 12 from the water 44055-gallon drums, 1104 tires and enough plastic bags to cover a football field. Much of the waste will be 13 . Chads operation is the only one actually in 14 on the river, says Mark of the Mississippi River Basin Alliance, a union of environmental groups. Its the 15 Ive ever seen in 20 years, and he is inspiring others to do the 16 . The Mississippi was my back 17 , Chad says. In his teens he and his brother worked on the river as clammers and camped on islands 18 the waterway. The river has given me a livelihood and brought me so much 19 , Chad says. I wanted to do something in 20 .

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