补全对话
A. How many lessons do you have every day?
B. Why do you like it? C. Who is your P. E. teacher? D. How do you usually come to school? E. What's your favorite sport?
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A: Good morning， Zhou Jun.____
B: I usually come to school on foot.
A:____
B: Six. I have four classes in the morning and two classes in the afternoon.
A:____
B: My favorite sport is basketball.
A:____
B: Because it's very exciting(令人兴奋的).
A:____
B: Mr. Zhao. Look! He is playing basketball there.
A: Nice talking to you. Thank you.
表示阿伏加德罗常数的值。下列说法正确的是