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阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出一个最佳答案.
Chad performs his 24-foot aluminums boat past willow young trees that stick out of the waters of the Mississippi River. 1 dances off maples（枫树）,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 tree's 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 in1997 as Chad's one-man 8 to pick up rubbish along a 400-mile stretch of the2340-mile river That year, often working 9 , the 22-year-old young man 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 water44055-gallon drums, 1104 tires and enough plastic bags to cover a football field. Much of the waste will be 13 .
“Chad's operation is the only one actually in 14 on the river,”says Mark of the Mississippi River Basin Alliance, a union of environmental groups.“It's the 15 I've 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 clambers（掘蚌者）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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阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出一个最佳答案.
Chad performs his 24-foot aluminums boat past willow young trees that stick out of the waters of the Mississippi River. 1 dances off maples（枫树）,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 tree's 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 in1997 as Chad's one-man 8 to pick up rubbish along a 400-mile stretch of the2340-mile river That year, often working 9 , the 22-year-old young man 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 water44055-gallon drums, 1104 tires and enough plastic bags to cover a football field. Much of the waste will be 13 .
“Chad's operation is the only one actually in 14 on the river,”says Mark of the Mississippi River Basin Alliance, a union of environmental groups.“It's the 15 I've 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 clambers（掘蚌者）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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