2001年3月，某工艺品公司向银行贷款100万元，贷款期限为一年。双方约定：工艺品

若（a+b）²=63，（a-b）²=35，则a²+b²=______．

在对话的空白处填入适当的句子，使对话意思完整，每空一句。

A: Morning! Granny, You look so pale. (1)______________

B: Oh, boy. It's difficult for me to breathe.

A: (2) ______________

B: I've been like this since last month.

A: That's too bad. Did you sleep well last night?

B: (3) ______________ I can't sleep well at night because of the factory noise.

A: Pollution causes too many problems. I can't stand the environment here, either.

B: Shall we write to the newspaper about the problems?

A: (4) ______________ But I am afraid you have to see a doctor first.

B: (5) ______________ Thank you!

直接经验来源于实践，但是间接经验、书本知识并不来源于实践。 ( )

装载机当仅前桥两轮驱动时，主要用于装载作业。

点火提前