主动脉弓及其主要分支的三大主要变异包括：__________________、___

下列体现实事求是思想原则的会议是（   ）

①中共八大 ②1961年广州工作会议 ③八届二次会议 ④十一届三中全会

A．①③④

B．①②④

C．①②③④

D．②③④

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（工艺）practised 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 practised toady has changed very little since the Middle Ages. Over 800 full-time thatchers are employed in England and Wales today, keeping 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 get 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 defiance against the heat.

小题1:Which of the following remains a special 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.小题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.小题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小题4:People in developing countries also live under thatch because ________.

A．thatched cottages are a big tourist attraction

B．thatched roof houses are the cheapest

C．thatch is an effective defense against the heat

D．they like thatched houses better than other buildings

国际政治中的族际斗争不是谁是谁非的问题，而是独一无二的种族归属感与难以兼容的各种族自决梦想之间的冲突，种族归属感是客观存在的，但西方多年来倡导的民族自决原则在很大程度上鼓励了这种归属感发展成为一种力图建立独立国家的民族意识。因此( )。

A．民族自决原则导致各民族都建立国家

B．国家都是经民族自决才建立的

C．民族自决权有利于维护各民族，特别是弱小民族权力

D．听起来美妙的民族自决原则可能成为无休止的族际冲突的堂皇借口

丘的编号按( )编号。

A．三级
B．四级
C．五级
D．六级