空运货物的货物体积÷体积重量=（）m3/kg。A．6 B．0.6 C．0.06 D．

阿拉伯国家中人口最多的城市是               。

阅读理解。

     On May 23,1989, Stefania Follini came out from a cave at Carlsbad,New Mexico. She hadn't seen

the sun for eighteen and a half weeks.  Stefania was in a research program,and the scientists in the

program were studying body rhythms (节奏) . In this experiment Stefania had spent 130 days in a cave,

30 feet in depth.

     During her time in the cave,Stefania had been completely alone except for two white mice. Her living

place had been very comfortable,but there had been nothing to tell her the time. She'd had no clock or

watches,no television or radio.  There had been no natural light and the temperature had always been

kept at 21℃.

      The results were very interesting. Stefania had been in the cave for over four months,but she thought

she had been there for only two. Her body clock had changed. She hadn't kept to a 24-hour day. She

had stayed awake for 20-25 hours and then had slept for 10 hours.  She had eaten fewer meals and had

lost 17 lbs in weight as a result ! She had also become  rather depressed (抑郁) .

     How had she spent her time in the cave? As part of the experiment she'd done some physical and

mental tests.She'd recorded her daily activities and the results of the tests on a computer. This computer

had been specially programmed for the project.  Whenever she was free, she'd played cards,read books

and listened to music.  She'd also learned French from tapes.

      The experiment showed that our body clocks are affected by light and temperature,for example,the

pattem of day and night makes us wake up and go to sleep.  However,people are affected in different

ways.  Some people wake up naturally at 5:00 am,but others don't start to wake up till 9:00 0r 10:00 am.  This affects the whole daily rhythm.  As a result,the early risers are at their best in the late moming.

The late risers,on the other hand,are tired during the day and only come to life in the aftemoon or evening !

1. Stefania stayed in the cave for a long time because___.  

A. she was asked to do research on mice

B. she wanted to experience loneliness

C. she was the subject of a study

D.  she needed to record her life

2. What is a cause for the change of Stefania's body clock?    

A. Eating fewer meals.

B.  Having more hours of sleep.

C. Lacking physical exercise.

D.  Getting no natural light.

3. Where doos the text probably come from? 

A. A novel.                                

B. A news story.

C. A pet magazine.                          

D. A travel guide.

插花的含义

肺心病的诊断依据是

A．长期肺、支气管病史

B．肺动脉高压及右心室扩大征象

C．肺气肿体征

D．动脉血二氧化碳分压≥7.3 kPa

E．动脉血二氧化碳分压≤8.0 kPa

GSM是一种（）通信系统。

A.数字

B.模拟

C.移动

D.固定