unit 13
I.单项选择。从下列每题所给的A、B、C、D四个选项中选择一个最佳答案。
1. Asian elephants are endangered,_______ they are strong creatures.
A. but B. if C. although D. so
2. There______ a lot of tigers there, but now they are endangered.
A. were ud B. ud to be C. ud to D. ud to have喝茶睡不着
3. -Why was the old building_______?
- Becau they want to t up a theme park there.
A put down B cut down C pulled down D. turned down
4. -Do you think shark's fins are______ health?
-
-No, I don't think so. There are no scientific studies to support that idea.
A. good for B good at C good with D good of
5. -Look, the river is so dirty.
--Becau there is______ rubbish at the bottom of the river.
A. too many B. many too C. too much D. much too
6. -How much should I_____ the book?
- Ten dollars.
A spend with B. take C. cost D pay for
7. -Don't throw away old books. They can be recycled and______.
--Yes, you're right. Then we can save more trees.
A brought back B t up C. put to good u D. cut off
8. -Shall we have a rest?
--Not now. I don't want to stop______ yet.
A to work B working C worked D to working
9. -Have you ever______ keeping the city clean?
--Yes. I helped with a Clean-Up Day last week.
A taken part in B t up C thought about D heard of
10. -Have you heard of Amy Hayes?
--Yes, She's an interesting person. I heard her hou is______ rocks and old glass bottles.
A.made in B. made of C made from D. made for
II.根据语意，利用所给单词完成文中句子。美容去斑
We polar bears need to be really fat in order to have healthy babies. But becau of global warming, we aren't as fat as we (1)_______ to be and we aren't having as many babies. We get fat when we can hunt a lot of als. We can only hunt als (2)_______there is a ice for us to hunt from.
Global warming is ( 3)_______ the a ice melt. We don’t have much time to hunt (4)______
印务 the ice melts too early. Once the ice is gone for the year, we have to go to the shore. When we get to the shore, if we are very fat and(5)_________, we can have babies. But if we are too thin, we won't have any babies.
There are about 900 polar bears in Hudson Bay now. If the ice continues to melt too fast. the numbers of polar bears will drop.
胸腔疼痛III.交际运用
用方框中的句子补全对话，其中有一个选项是多余的。
A: Amy, would you like to protect the earth?
只有一个男人 B: I'd love to, but as a student, what can I do?
A: Well, (1)__________________幼儿园教师心得
B: That's easy What's next?
A:(2)________________ Tell your parents to ride bikes, Too.
B: That can also save us money. What el?作鸟兽散
A: Third, (3)________________
全马是多少公里 B: That's a good idea. I have a lot of ud paper at home.
