对象一关系数据库系统的特点包括______。 ①扩充数据类型 ②支持复杂对象

阅读理解。

     Stephen Hawking was bom in 1942. He's a world farnous acientist and exper on space and tine.Stephen in

trying to find the snswers to some very big questions.such as:How did the uni-verse begin?How will it end?

     Stephen was a strdent at Oniversity. He studied math and science.Then, at the age of twenty. he became

very ill. He was so young, but the doctors said to his family,"He has only two more years to live,"The doctors

were wrong-he didn't die "He can't walk now but he usea a wbeclchair (轮椅). He talks with the help of a

computer.After Oxrord,Stephen went to Canadridge Univeraity.Three years later, in 1965, he became a doctor (博士) of philosophy (哲学).

     Because of his health problems, it was difficuk for him to draw diagrams or to write.So he star-ted to think

in pictures.With this new way of thinking,he became one of the most famous scientists in the world, In1981,

he met the Pope (教室) in Rome.They talked about his ideas. Then in 1988, he wrote his first important book,

A Brief Histary of Time.It aold more than 5.5million cop-ies (册) in 333 difcrent Langusgees.

1.What did Stephen Hawking study at Oxlord University?

_______________________________________________________________________________

2.What did he decome very ill?

______________________________________________________________________________

3. What did the doctors dhink of his disease?

______________________________________________________________________________

4. What kind of person do you think Stephen Hawking is?

______________________________________________________________________________

下列账户借方中核算存货的实际成本的有（）。

A.材料采购

B.采用计划成本法核算的企业下设的原材料

C.在途物资

D.采用实际成本法核算的企业下设的原材料

请以“幸福”开头，依照例句的句式，仿写两句，使之构成一个排比句。  （6分）

幸福是“临行密密缝，意恐迟迟归”的牵挂。幸福是“衣带渐宽终不悔，为伊消得人憔悴”的思念;                              ；                                       。

陕西出土的秦始皇兵马俑，其表面涂有生漆和彩绘，这为研究秦代军人的服色提供了重要信息。但兵马俑出土后，表面的生漆层会很快发生起翘和卷曲，造成整个彩绘层脱落，因此必须用防护液和单体渗透两套方法对兵马俑进行保护，否则不能供研究使用。而一旦采用这两套方法对兵马俑进行保护，就会破坏研究者可能从中获得的有关秦代彩绘技术的全部信息。
如果以上陈述为真，以下哪项必然为真

A．采取保护措施后的秦兵马俑只能提供秦代军人的服色方面的信息。

B．一个供研究秦代军人的服色使用的兵马俑不能成为了解秦代彩绘技术的新信息的来源。

C．秦兵马俑是了解秦代彩绘技术的唯一信息来源。

D．一个没有采取保护措施的兵马俑能够比采取保护措施后的兵马俑提供更多的信息。

除去下表中各物质（A、C为溶液）中的少量杂质，所选用的试剂、方法正确的是（　　）

A．A、

B．B、

C．C、

D．D、