阅读理解。

                                                                         A Key Deer

     A Key deer is a small deer. It is about the size of a large dog. Sometimes it is called a "toy deer". This deer

lives in only one place in the world. That place is Florida. Not long ago, there were only 50 Key deer left. Would

all the Key deer soon be gone? Some people worked very hard to save the animals. Their hard work helped.

Now there are more than 700 Key deer.

1. A Key deer is the size of a large _____. [ ]

A. dog

B. cat

C. cow

2. This story does not tell about _____.[ ]

A. where Key deer live

B. the size of Key deer

C. what the Key deer eat

3. In the third part of the story,what does the word "left" mean?

用过氧化物硫化和树脂硫化各须注意哪些问题？