But how would scientists get the tree snakes to eat Tylenol? They came up with a plan. First, the experts put the medicine into dead mice. Then they attached each mouse to a mini paper parachute (降落伞). Planes dropped the mice over Guam. The parachutes got caught in the trees. The mice became dinner for the snakes that live there.

　　Has it worked? So far, research shows that there are fewer snakes because of the mice. The worry is that it may be too late to clear the snakes, but Mr.Vice from Guam's Department of Agriculture says this should not stop the islanders from trying. "Our long­term goal is to kill the snake off completely，" he says.

　　语篇解读：本文是说明文。棕树蛇给关岛上的居民和动物带来严重的困扰。为了除掉它们，科学家使用了体内装有泰诺这种药物的死老鼠。

　　8．What can we learn about the brown tree snakes?

　　A．They were shipped to Guam on purpose.

　　B．They were not native to Guam.

　　C．They were at risk in the 1940s.

　　D．They grew very slowly.

　　解析：选B　细节理解题。根据第二段中的"The snakes likely arrived in the 1940s ... Snake families grew."可知，棕树蛇是关岛的外来物种。

　　9．What does the underlined word "devastating" in Paragraph 3 mean?

　　A．Magical. B．Damaging.

　　C．Short­term. D．Interesting.

　　解析：选B　词义猜测题。根据第三段中的"There used to be 12 kinds of birds on the island ... This causes millions of dollars in damage."可知，棕树蛇对关岛上的动物有毁灭性的影响。

　　10．What was a more workable way to kill the brown tree snakes?

　　A．Letting them eat Tylenol carried by mice.

　　B．Putting Tylenol in the trees.

　　C．Bringing in their enemies.

　　D．Using snake traps.

解析：选A　推理判断题。根据第五段中的"Even a little bit of Tylenol can kill a brown tree snake."及第六段中的"experts put the medicine into dead mice"和最后一段中的"So far, research shows that there are fewer snakes because of the mice."可知，科学家在关岛上投