根据图画及上下文提示，在下面对话的空白处填入适当的话语（话语可以是句子、短语或词），使对话完整。

A：Hey, Ginny．What do you call those big，gray things in the water?

　　B：__1__．

　　A：What?

　　B：Manatees。They’re very gentle and very shy．

　　A：__2__？

　　B：They’re usually about 10 feet long and they weigh about 1000 pounds．

　　A：How much do they need everyday?

　　B：They need about 1 00 pounds of aquatic food a day．

　　A：__3__?

　　B：It is underwater plants and vegetation（植被）．

　　A：That’s what they eat?

　　B：Yes．it is．

　　A：__4__?

　　B：Yes，they are endangered（陷入困境）．But，we’re trying to save them

　　A：Wait a moment．Why are they endangered?

　　B：__5_．

　　A：Where do they live?

　　B：They live in the swamps（沼泽）．__6__ ．They are endangered also because there sometimes isn’t enough food for all of them．

　　A：__7__．There used to be a lot of manatees，but now there aren’t very many of them left，I think．

　　B：Yes，__8__ ．At this point，there are only about 2，500 in the U．S．

　　A：__9__?

　　B：Since 1927 laws have been passed to protect them．

　　A：Thank you for your information．

B：__10__．

My name is Lin Ping. I’m twenty – six, I teach English in No. 19 Middle School. I go to  school at seven in the morning. I have forty – eight students in my class. Twenty – six are boys and twenty – two are girls.

　　Tom and Jim are my new students. They are twins. They look the same. They are American boys. They like English and they like Chinese, too. They are good students.

(   )1. ---How old is Lin Ping? ---He is ________.

　　  A.24 　　　　　　　B.36 　　　　　　　　　C.26

(   )2. Is Lin Ping an English teacher?

　　    A. Yes, he is. 　　B. No, he isn’t.　　　C. Yes, he isn’t.

(   )3. Lin Ping has __________ students in his class.

　　   A.26 　　　　　　　B.22 　　　　　　　　　C.48

(   )4. ---Who are Tom and Jim? ---They are ______ boys.

　　   A. English 　　　　B. American　　　　　　C. Chinese

(   )5. Are they twins?

　　  A. Yes, they are.　B. No, they aren’t. 　C. They are good students.