内生肌酐清除率测定的临床意义为（）。 A.指导临床治疗 B.判断肾小球损害的敏感指标

一个理想单摆，已知周期为T，如果由于某种原因（如移到其他星球），自由落体加速度为原来的1/2，振幅为原来的1/3，摆长为原来的1/4，摆球质量为原来的1/5，则它的周期为     。

下列选项为配制50g溶质质量分数为5%的氯化钠溶液的步骤，其先后顺序正确的是[ ]

A．称量- 计算- 溶解- 转液贴签

B．计算- 称量- 溶解- 转液贴签

C．计算- 称量- 转液贴签- 溶解

D．计算- 溶解- 称量- 转液贴签

阅读理解

     Five people are at our table, including myself. I've already learnt a great deal about them in the short

time we've been at sea,although we rarely meet except at mealtimes.

      First of all, there's Dr Stone. He's a man of about sixty-five, with gray hair and a friendly face. He

gave up his work a short while ago and is now traveling round the world before he retires to some quiet

country village. As a young man, he served for many years as a doctor in the army and visited many

countries. He's told us a great deal about the city to which we are going.

     Then there's "Grandmother".  I call her that because her name escapes me. In spite of being a

grandmother, she looks remarkably young, not more than fifty. She's on her way to visit a daughter who

went to Australia some years ago. Naturally she is very excited at the thought of seeing her again,  and

her three grandchildren, whom she has never seen.

     Then there's a man I don't care for very much, an engineer by the name of Barlow. He has been on

leave in England and is now returning to his work in Singapore.

     The other person who sits at our table is Mrs Hunt. I've found out hardly anything about her. She's

extremely quiet and rarely talks, except to consult the doctor about children's various illnesses.She's on

her way to join her husband in India.

1. What can we know about Mr Stone?

A. He is a doctor in the army now.

B. He is going to give up his work.

C. He knows a lot about the city the author is going to.

D. He has been retired for many years.

2. The writer calls the second person "Grandmother" because___________.

A. she looks old

B. she has three daughters

C. he respects her

D. he can't think of her name

3. The underlined phrase "on leave" ( in Paragraph 4)  means"________".

A. about to go              

B. on vacation

C. leaving                  

D. at home

4._________ lives in India.

A. The doctor              

B. Grandmother

C. Mrs Hunt              

D. Mr Hunt

警告标志的含义是提醒人们对周围环境引起注意，以避免可能发生危险的图形标志。其基本外型是。（）

A.带斜杠的圆形框

B.圆形边框

C.正三角形边框

下列哪部作品是柴科夫斯基的代表作（）。

A.《幻想交响曲》

B.《天鹅湖》

C.《茶花女》

D.《匈牙利狂想曲》