下列曲线中，能正确表示玉米从种子萌发到长成绿色的幼苗后有机物含量变化的是（ ）

治疗阴虚有热，心烦，失眠者，宜选用（）。

A.南沙参

B.北沙参

C.石斛

D.百合

E.大枣

阅读理解。

     The view over a valley of a tiny village with thatched(草盖的)roof cottages around a church; a drive

through a narrow village street lined with thatched cottages painted pink or white; the sight over the

rolling hills of a pretty collection of thatched farm buildings __these are still common sights in parts of

England. Most people will agree that the thatched roof is an essential part of the attraction of the English

countryside.

     Thatching is in fact the oldest of all the building crafts practiced in the British Isles. Although thatch

has always been used for cottage and farm buildings, it was once used for castles and churches, too.

     Thatching is a solitary(独自的)craft, which often runs in families. The craft of thatching as it is

practiced has today changed very little since the Middle Ages. Over 800 full-time thatchers are

employed in England and Wales today, maintaining and renewing the old roofs as well as thatching

newer houses. Many property owners choose thatch not only for its beauty but because they know

it will keep them cool in summer and warm in winter.

     In fact, if we look at developing countries, over half the world lives under thatch, but they all do

it in different ways. People in developing countries are often unwilling to go back to traditional materials

and would prefer modern buildings. However, they may lack the money to allow them to import the

necessary materials. Their temporary mud huts with thatched roofs of wild grasses often only last six

months. Thatch which has been done the British way lasts from twenty to sixty years, and is an effective

defence against the heat.

1.Which of the following remains a unique feature of the English countryside?

A. Narrow streets lined with pink or white houses. 

B. Rolling hills with pretty farm buildings. 

C. Cottages with thatched roofs. 

D. churches with cottages around them.

2.What do we know about thatching as a craft? 

A. It is a collective activity. 

B. It is practised on farms all over England.

C. It is quite different from what it used to be. 

D. It is in most cases handed down among family members.

3.Thatched houses are still preferred because of _______. 

A. their style and comfort 

B. their durability 

C. their easy maintenance 

D. their cheap and ready-made materials

4. We can learn from the passage that ________ 

A. thatched cottages in England have been passed down from ancient times 

B. thatching is a building craft first created by the English people 

C. the English people have no special liking for thatched houses 

D. most thatched cottages in England are located on hillsides

概念结构设计的目标是产生数据库概念结构(即概念模式)，这种结构主要反映______。

A．DBA的管理信息要求

B．应用程序员的编程需求

C．企业组织的信息需求

D．数据库的维护需求

将违约的形式划分为违反要件和违反担保是（）

A.大陆法

B.英国法

C.美国法

D.《联合国国际货物销售合同公约》

净经营收入理论认为融资总成本会随着融资结构的变化而变化。 ( )