Last August Susan and 42 other students got wet and dirty while (36) 6 tons of garbage from the river running across their city. They cleaned up the river as part of a week long environmental (37) Like one in three American rivers, this river is so polluted that it’s unsafe for (38) and fishing. Still, Susan, who has just completed her third summer on the river (39) , sees a change in this river. "Since we started 3 years ago, the river is getting a lot cleaner.’ She says. Environmental scientists praise the (40) for removing the garbage that can harm the wild life. Water birds, for example, can (41) on plastic bottle rings and get cut by scrap metal. Three years ago, when the clean-up started, garbage was (42) . But this year, the teenagers had to (43) for garbage. (44) . By the end of the six-hour shift, (45) "Seeing all that garbage in the river makes people begin to care about environmental issues." Susan says. She hopes that when others read that she and her peers care enough to clean it up, (46) .
【参考答案】
they had removed enough garbage to f’ill more than two large......