为解决北方地区严重缺水的矛盾，我国正在实施的一项重要工程是：[ ] A．三峡工程

中心静脉压的高低可反映（）。

A.动脉血压高低

B.心脏射血能力和静脉回心血量的相互关系

C.胸膜腔的压力

D.静脉系统的容量

E.腔静脉压力

句型转换。

1. The old man was too tired to walk on.

  The old man was _______ tired _______ he couldn't walk on.

2. Mike is the tallest in his class.

  Mike is taller _______  ________  ________  ________ in his class.

3. I will go to bed when I finish writing the letter.

  I _______ go to bed _______ I finish writing the letter.

4. It's about half an hour's walk.

  It takes about half an hour to go there _______  ________.

5. Work hard, and you will get good marks.

  _______  _______ work hard, you'll get good marks.

6. John was busy at 9 last night.

He was writing his English composition at 9 last night.

John _______  _______  ________ his English composition at 9 last night.

在确定目标市场与投资者方面，基金销售机构面临的重要问题之一就是分析投资者的真实需求，其中不包括投资者的（）。

A.教育背景

B.投资规模

C.风险偏好

D.对投资资金流动性和安全性的要求

《资治通鉴》成书于( )。

A．西汉

B．东汉

C．北宋

D．南宋