一门课程可以由若干个学生选修，一个学生也可以选修若干门课程，则课程与学生之间的联系是

如果不动显微镜的其他部分，只是转动转换器，将物镜由10x转换成45x，视野中的光线将会（）

A．变亮

B．变暗

C．无变化

D．无规律变化

某企业甲责任中心将A产品转让给乙责任中心时，厂内银行按A产品的单位市场售价向甲支付价款，同时按A产品的单位变动成本从乙收取价款。据此可以认为，该项内部交易采用的内部转移价格是( )。

A．市场价格

B．协商价格

C．成本转移价格

D．双重转移价格

遇外宾蓄意挑衅时应如何处理？

某化学小组采用类似制乙酸乙酯的装置（如图1），以环己醇制备环己烯

已知：

	密度（g/cm3）	熔点（℃）	沸点（℃）	溶解性
环己醇	0.96	25	161	能溶于水
环己烯	0.81	-103	83	难溶于水

（1）制备粗品将12.5mL环己醇加入试管A中，再加入1mL浓硫酸，摇匀后放入碎瓷片，缓慢加热至反应完全，在试管C内得到环己烯粗品．

①A中碎瓷片的作用是______，导管B除了导气外还具有的作用是______．

②试管C置于冰水浴中的目的是______．

（2）制备精品

①环己烯粗品中含有环己醇和少量酸性杂质等．加入饱和食盐水，振荡、静置、分层，环己烯在______层（填上或下），分液后用______（填入编号）洗涤．

a．KMnO₄溶液b．稀H₂SO₄c．Na₂CO₃溶液

②再将环己烯按图2所示装置蒸馏，冷却水从______口进入，目的是______．

③收集产品时，控制的温度应在______左右，实验制得的环己烯精品质量低于理论产量，可能的原因是______

a．蒸馏时从70℃开始收集产品

b．环己醇实际用量多了

c．制备粗品时环己醇随产品一起蒸出

（3）以下区分环己烯精品和粗品的方法，合理的是______．

a．用酸性高锰酸钾溶液b．用金属钠c．测定沸点．

阅读理解

     Despite the fact that it has never been seen almost everyone is familiar with the legendary unicorn

(独角兽). Descriptions of unicorns have been found dating from ancient times. 'The great

philosopher Aristotle theorized that there were two types of unicorn-the so-called Indian Ass and the

Oryx, a kind of antelope. Unicorns are often used in the logo of a noble family, town council or university

as their special sign. Even Scotland is represented by aunicom.

     According to the legend, anyone attempting to catch a unicorn had to be extremely cautious as it has

a reputation for being very fierce. A clever trick suggested by unicorn-trappers ,in order to catch this

magnificent beast without being hurt by its horn, was for the hunter to stand in front of a tree and then to

move quickly behind it as the unicorn charged. Hopefully, the creature could then be captured when its

horn was stuck in the tree.

     When hollowed out and used as a drinking-cup, the unicorn's horn was said to have the power to

offer protection against poison. It was believed that nobody could be harmed by drinking the contents

of a unicom's horn. Right up until the French Revolution in 1789, the French court was said to have used

cups made of "unicorn" horn in order to protect the king. In addition, the horn was said to have medicina

l value,so much so that it could be sold for more than ten times the price of the same weight of gold.

What, then, was " unicorn" horn? We know at times the rhino (犀牛)  was confused with this legendary

creature. A drinking-cup supposedly made of "unicorn" horn was discovered to be made of the horn of

a rhino.

1. Which of the following is TRUE of the unicorn? 

A. It was not historically recorded.

B. Its horn was first used in France.

C. It was similar to the Indian Ass and the Oryx.

D. It could be the symbol of a university.

2. To catch a unicorn, the unicorn-trappers had to try all of the following EXCEPT__________ . 

A. tempting the unicorn to attack

B. making use of the tree as a protection

C. hiding quickly behind the unicorn

D. having quickly behind the unicorn

3. The last paragraph is mainly about __________. 

A. the properties of the unicorn horn

B. the users of the unicorn horn

C. the price of the unicorn horn

D. the comparison between the unicom horn and the thino horn

4. In the last paragraph, the word  " unicom" is in quotation marks(引号) because________.

A. the cup is designed only for a royal family

B. the unicorn does not exist in reality

C. the unicorn is the rarest animal in the world

D. the medicinal value of the horn is appreciated