从所给出的单词中选出合适的选项完成对话。
| A. animals B. pandas C. danger D. about E. reading |
A: What are you doing, Ben?
B: I'm a book.
A: What is the book about?
B: It's about animals. These animals are in
A: What are they?
B: They're pandas, South China tigers and blue whales.
A: How many are there in the wild?
B: There are only one thousand six hundred pandas in the wild.
A: How about blue whales?
B: There are about ten thousand in the wild.