补全对话
Alice: Hi, Frank! Are you free on Saturday?
Frank: Yes.____
Alice: I heard a baby panda was born in the zoo. Let's go and have a look.
Frank: Oh, I have been there twice. I think you'd better learn something about pandas before you go to the zoo.
Alice: I know a little.____There are about 2,000 pandas living in the forests.
Frank: That's true. They are in danger now.
Alice: Why? Is it because they don't have babies very often?
Frank:____ Another main reason is that humans cut down lots of bamboo forests, and pandas don't have enough food to eat.
Alice: That's too bad !____
Frank: We can make some posters to tell people to save pandas.
Alice: I will take some photos of the pandas first when I visit the zoo.
Frank:____Have a good time!
Alice: Thank you.
A.Don't forget to show me the photos when you come back.
B.A mother panda has only one baby every two years. C.What can we do to help them? D.This is one of the reasons. E.Is it very cute? F.I will have a quite relaxing day tomorrow.
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aHCO， ④尿素