什么叫机床的几何精度？

补全对话（共5个小题；每小题1分，满分5分）
根据对话内容，从方框中所给的七个选项中选出五个句子补全对话，使对话完整、通顺。
A：Hello，Mike! What’s the time?
B：小题1:
A：Where’s Bob? I can’t find him.
B：I don’t think he can come.
A：小题2:
B：He has to look after his sister.
A：小题3:
B：She doesn’t feel well.
A：小题4:                Did she go to see the doctor?
B：Yes．
A：小题5:
B：The doctor said nothing serious，but she has to rest.

A. Why can’t he come?                 B. I’m sorry to hear that. C. Where did the doctor go?             D. It’s half past eight. E. What did the doctor say?              F. I’m glad to hear that. G. What’s wrong with his sister?