一金属杆一端置于沸水中，另一端和冰接触，当沸水和冰的温度不变时，则金属杆上各点温度将不随时间而变化．试问金属杆这时是否处于平衡状态？为什么？

⑴How old are you ?____                     A. He is a doctor.

⑵What's your name?____                   B. I have a cold.

⑶What does he do?____                    C. My name is Anna.

⑷What are they doing?____               D. I'm ten years old.

⑸What's wrong with you ?____          E. They are waiting outside the teacher's office.

⑹What does she see?____                  F. She sees some birds.

We must study hard____ ____ we can get good grades.

形近字组词 

抄____       蚊____

纱____       纹____