情景交际。 从Ⅱ栏中找出Ⅰ栏各句的应答语。

                               Ⅰ                                                Ⅱ

(     ) 1.  How old is your teacher?                    A.  Yes, she is.

(     ) 2 . What color is your bag?                      B.  Sorry, I don't know.

( ) 3.  Is the girl tall?                                     C.  How do you do?

( ) 4.  How do you do?                                D.  It's yellow.

(     ) 5. Who is the man in the car?                   E. My teacher is fine.

( ) 6. Thanks very much.                               F. He is my friend.

(     ) 7. What are those in English?                   G. He is tall and strong.

(     ) 8. How is your teacher?                           H. Yes, I do.

(     ) 9. Do you have a knife?                           I. They are cakes.

(     ) 10. What does your teacher look like?     J. You are welcome.

了解有机物分子中化学键特征以及成键方式是研究有机物性质的重要基础。下列关于有机物分子的成键方式的描述不正确的是

A．烷烃分子中碳原子均采用sp³杂化成键

B．苯分子中碳原子间是以σ键和π键交替连接

C．苯乙烯分子中所有碳原子均采用sp²杂化成键

D．苯环中存在6个碳原子共有的大π键