对关系S和关系R进行集合运算，结果中既包含S中元组，也包含R中元组，这种集合运算称为

一只跳蚤在一条数轴上从原点0开始，第一次向右跳一个单位，第二次向左跳2个单位，第三次向右跳3个单位，第四次向左跳4个单位，…，依此规律跳下去，当它跳2012次下落时，落点处离原点0的距离是（    ）个单位．

upside down,  be bound to do  , in favour of , take in,  for sure  , leave out

make any difference,  every time,  in the meantime, as far as ,take up,

1.___________ I returned after an absence　, I felt stupid because I was behind the others.

2. This sentence is too long, so I have to __________ some words in it.

3. The doctor will be here soon. __________________, try to relax.

4. The child is so cute. He is holding the book _______________.

5. She ________________ stamp-collecting when she was young.

6. It doesn’t _______________ if you are late for my party. I just wish you to come.

7. Besides, _______________ he was concerned, what other people thought was not the most important thing.

8. While most of us are _____________________the plan, it remains to be seen whether it is practical enough.

奶牛，产后3周，食欲减退，便秘，迅速消瘦，并表现转圈、摇摆、无目的地吼叫和冲撞等症状。这些症状间断性多次发生，每次持续1h，间隔8～12h重新出现。乳汁易形成泡沫，加热时有烂苹果气味。临床上常用的快速简易诊断方法是（）

A.检测血液、尿液和乳汁中有无酮体

B.检测血糖浓度

C.检测血液游离脂肪酸浓度

D.检测血钙浓度

E.检测血液中异丙醇浓度

案例五：患者，女，42岁，因散瞳检查眼底，3小时后出现头痛、恶心、呕吐、眼部胀痛且视物不清，眼部结膜充血，角膜雾状混浊，瞳孔散大，直径约5mm，对光反应消失，余窥不清。

该病例的诊断是（）

( )是组织在其工作中直接形成的有保存价值的历史记录。

A．信息

B．文件

C．档案

D．资料