人教版（2019）选修1《Unit 5 Working the Land》2021年同步练习卷（板块二）

Ⅰ.阅读理解

• 1．Guam is a beautiful，small island in the Pacific Ocean.You'll find happy songbirds，clear blue water，and leafy forest there.But the small island has a big problem：snakes.There are about 2 million brown tree snakes living in Guam.
     The snakes likely arrived in the 1940s.They probably slipped （滑行） unseen onto ships and planes heading to Guam.Once there，the snakes laid eggs.Snake families grew.The snakes have no natural enemies to eat them on Guam.Soon，the island was covered with these snakes.
     The brown tree snake has had a devastating effect.The snakes eat birds.There used to be 12 kinds of birds on the island.But these snakes have killed off nine kinds of the birds.The snakes can grow to be 10 feet long.They often bite humans.They climb onto power lines and make the electricity go out.This causes millions of dollars in damage.
     Scientists have tried many different ways to control the number of snakes.They have used snake traps and snake-sniffing dogs.Nothing seemed to work.Nothing，that is，until they found a surprising secret weapon（武器）：killer mice.
     Scientists found out that there is one easy way to kill brown tree snakes.They could give them a medicine called Tylenol.People take Tylenol for headaches and other pains.Even a little bit of Tylenol can kill a brown tree snake.
     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 long-term goal is to kill the snake off completely，" he says.
  
  （1）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.
  （2）What does the underlined word "devastating" in Paragraph 3 mean？

  
  A．Magical.
  B．Damaging.
  C．Short-term.
  D．Interesting.
  （3）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.
  （4）What does Mr Vice think of solving this snake problem？

  
  A．He is proud of it.
  B．He is hopeful of it.
  C．He is doubtful about it.
  D．He is unconcerned about it.
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