企业拟进行一项投资，投资收益率的情况会随着市场情况的变化而发生变化，已知市场繁荣、一

————That was a green dinner. _______ 

————Thanks. But it really only took an hour.

A．I have never had it before.

B．I enjoyed it very much.

C．You must have spent all day cooking.

D．You must be tired.

I told her we weren’t going to be friends any more because she couldn’t ________ .

A．keep her word

B．have her word

C．keep her words

D．have her words

铣床精度验收标准对铣床几何精度的允差有有明确规定，而检验方法必须由操作工人自行确定。

为促进区域发展，我国在该地区已建成的著名工程是（）

A.南水北调

B.青藏铁路

C.西气东输

D.西电东送

请根据所学知识，回答与小白鼠生命活动调节相关的问题：

机体进行正常生命活动的必要条件是（），维持该必要条件的主要调节机制是（）调节网络。（）是人体调节内分泌活动的枢纽。