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3. We must do something ___________ (stop) people from killing tigers.
4. Is ___________ (raise) pets at home right or wrong?
5. It’s important ____________ (feed) tigers in the open air.
III. 根据所给汉语，完成下列句子，每空一词。
1. 他们班的学生数是40.
_________ _________ __________ the students in their class is 40.
2. 动物对环境很重要。
Animals are very ______________ _____________ the environment.
3. 老虎住在什么地方?
_____________ ____________ tigers live?
4. 很多动物正在消失。你知道为什么吗？
Many animals _____________ ___________. Do you know why?
5. 保护动物是我们的责任。
_____________ _____________ _____________ our duty.
Ⅳ、单项选择。
( ) 1. Trees used to be____for cooking by the villagers some years ago.
A. cut up B. cut down
C. cut off D. dropped to
( )2. The tiger is_____the food chain.
A. at the bottom of B. at the foot of
C. at the top of D. in the middle of
( )3. The price of the meat has dropped______20 yuan a kilo this year.
A. in B. at C. with D. to
( )4. The patient is____.The doctors are doing their best to save him.
A. out of danger B. dangerous
C. in danger D. danger