在组织设计中，将组成部分连成整体，保证整个组织结构协调一致、有效运行的关键是（）。

下列叙述中正确的是（　　）

A．化合反应不一定都属于非氧化还原反应

B．阳离子只有氧化性，阴离子只有还原性

C．在氧化还原反应中，肯定是一种元素被氧化，另一种元素被还原

D．含氧酸能起氧化作用，无氧酸则不能

口服给药，经主动转运的药物有（）

A.维生素B₁

B.维生素B₆

C.维生素C

D.维生素A

E.钙剂、铁剂

在过去的2011年，因受各种因素的影响，猪肉市场的价格在不断变化，据调查去年6月份猪肉价格是1月份猪肉价格的1.2倍，而12月份猪肉价格回落到6月份猪肉价格的90%；

（1）设去年1月份猪肉价格为每斤x元，用含有x的代数式分别表示去年市场6月份、12月份的猪肉价格；

（2）若某学校食堂用81元在6月份购得猪肉比在12月份购得的猪肉少0.5斤，求去年1月份猪肉价格．

阅读理解.

     Willa Cather once said,"When people ask me whether writing has been a hard or easy road,

I always answer with the famous saying: The end is nothing；the road is all.That is what I mean

when I say writing has been a pleasure.I have never used the computer with the thought that

one more task had to be done."

Like most writers,Willa Cather did not write books for the money that they brought her,but

rather for the pleasure that came in their writing.Her works were,like her,simple and full of

the vigor of her days in Nebraska,where she grew from child to young womanhood and

where she developed a deep love for the treeless land of the great plain with its wild flowers,

wheat fields and rivers.

     "It's a rather strange thing about the flat country," she wrote later."It takes hold of you

or it leaves you perfectly cold.A great many people find it very dull；they like a church

tower,an old factory,a waterfall,the country all made to look like a German Christmas card

...But when I come to the open plain,something happens.I'm home.I breathe differently."

1．Willa Cather wrote because she found writing________.

A．simple and lively

B．opened up a road to success

C．neither too hard nor too easy

D．interesting and enjoyable

2．What was the place like where Cather grew up?

A．It was cold,plain and without a church.

B．It was vast,open and flat.

C．It was like a German Christmas card.

D．It was a colorful world of wild flowers.

3．When she said "It takes hold of you or it leaves you perfectly cold.",Willa Cather meant that________.

A．you either love the place or hate it

B．you decide either to stay or to leave

C．some find the place warm；others find it cold

D．some find the place peaceful；others find it wild

4．What happens when Cather comes to the open plain?

A．She breathes differently from others.

B．She wants to make the place her home.

C．She feels completely comfortable.

D．She finds the place similar to her home.