系统性红斑狼疮最有诊断意义的检查指标是（） A.抗组蛋白抗体 B.抗双股DNA抗体

如图为教科书中四个演示实验的图片，关于其对应的实验结论，下列说法正确的是

A．使用杠杆不能省功

B．导体的电阻跟导体的长度无关

C．对物体做功，物体的内能会增大

D．标准大气压的数值等于760 mm水银柱所产生的压强

阅读理解。

     The people who built Stonehenge in southern England thousands of years ago had wild parties,

eating barbecued pigs and breaking pottery.This is according to recent work by archaeologists-history

experts who investigate how human beings lived in the past.

     Archaeologists'digging near Stonehenge last year discovered the remains of a large prehistoric

village where they think the builders of the mysterious stone circle used to live.The village is about

4,600 years old,the same age as Stonehenge and as old as the pyramids in Egypt.It is less than two

miles from the famous ancient landmark and lies inside a massive man-made circular dirt wall,or

"henge",known as the Durrington Walls.

     Remains found at the site included jewellery,stone arrowheads,tools made of deer antlers,wooden

spears and huge amounts of animal bones and broken pottery."These finds suggest Stone Age people

went to the village at special times of the year to feast and party," says Mike Parker－Pearson from

Sheffield University in England.

     He said many of the pig bones they found had been thrown away half－eaten.He also said the

partygoers appeared to have shot some of the farm pigs with arrows,possibly as a kind of sport before

barbecuing them.

     An ancient road which led from the village to the River Avon was also found.Here,the experts think,

people came after their parties to throw dead relatives in the water so the bodies would be washed

downstream to Stonehenge.

     Parker－Pearson believes Stonehenge was like a cemetery where ancient Britons buried the dead

and remembered their ancestors."The theory is that Stonehenge is a kind of spirit home to the ancestors."

     The recent discovery of the village within the Durrington Walls shows that Stonehenge didn't stand

alone but was part of a much bigger religious site,according to Parker－Pearson.

     People still come to worship and celebrate at Stonehenge today.They meet there when the sun sets

on the shortest day of winter and when it rises on the longest day of summer.But the days of barbecuing

whole pigs there and throwing family members into the river are a thing of the past.

1. What was Stonehenge according to the text?

A．A village where hundreds of people once lived.

B．A place that regularly hosted large parties.

C．A church where local villagers would get married.

D．A site where dead people were placed or remembered.

2．The underlined word"It" ( Paragraph 2) refers to________.

A．the village  

B．Stonehenge

C．the pyramid  

D．the dirt wall

3．From the text we can infer that the people who came to the village________.

A．liked to drink wine  

B．knew how to hunt

C．were from Egypt  

D．lived by the River Avon

4．What do experts think people did after the village parties?

A．Returned to live at Stonehenge.

B．Prayed for good luck in the new year.

C．Hunted farm pigs as a sport.

D．Put their dead relatives in the river.

5．When do people most often go to Stonehenge today?

A．When a new discovery is made.

B．At the beginning of summer and winter.

C．On the longest and shortest days of the year.

D．When they want to have a barbecue.

孙某共用24000元买进甲、乙股票若干，在甲股票升值15%、乙股票下跌10%时全部抛出。共赚到1350元，则孙某最初购买甲、乙两支股票的投资比例是______。

A．5:3
B．8:5
C．8:3
D．3:5

扁平结构组织的优点是什么？