下面式子中，是整除的式子是（ ） A．4÷8=0.5 B．39÷3=13 C．5.2÷

自然界的物质存在各种物理性质，组成物体的物质不同，它们的性质一般不同。在弹簧测力计、橡皮泥、保险丝和指南针等物体中，利用磁性工作的是             ，利用弹性工作的是               。

Modcm inventions have speeded up people’s lives amazingly. Motor-cars cover a bundred miles in little more than an hour. Aireraft cross the world a day, while computers operate at lightning speed. Indeed, this love of speed seems never-ending. Every ycar motor-cars are produced which go even faster each new computer boasts（吹嘘）of saving preeious seconds in handling tasks.

All this saves timc, but at a prick.When we lose or gain half a day in speeding aeross the world in an airplane, our bodies tell us so. We get the uncomfoerable feeling known as jet-lag; our bodies feel tlru they have been left bebind in anot ar nine zoors Again pending too long at compulers resul’s in painti ninrts and fingers. Mobile phones also to dange according to some seientists; too much uss may thesmit h bul radiation into our brains, a we do not like to think about.

Howave, what do we do with the time we have saved?Certainly not or so it seems. We are so accustomed to constant activity that we find it difficult to sit and do nothing, or even just one thing at a time. Pcrhaps the days are long gone when we might listen quietly to a story on the radio, letting imavination take us into another world.

There was a time when some people’s lives were devotcd simply to the cultivation of the land or the eare of eattle. No multi-tasking there; their lives wenl on at a much gentler pace, and in a familiar pattern. There is much that we might envy about a way of life like this. Yet before we do so ,we must think of the hard tasks our ancestors faeed;:they farmed with bare hands, often lived close to hunger, and had to fashion tools from wood and stone. Modem machinery has freed peope fre that primitive existcnee.

1.The new rooucts opcome more and more time-saving beeause_________.

A.our love of speed secure never-ending

B.time is limited

C.theprices are increasingly high

D.the manufacturers boast a lot

2.What does“the days”in Paragraph 3 refer to?

A.I maginary life               B.Simple life in the past

C.Times of inventions           D.Time for constant activity

3.What is the author’s attitude towards the modem teehnology?

A.Critical            B.Objective        C.Optimistic            D.Negative

4.What does the pa mge mainly diseuss?

A.The present and past times             B.Machinary and human beings

C.Imaginations and inventions            D.Modem technology and its influenec

构成生活水平的因素有两个方面，一个方面是（），另一个方面是（）。

脊髓栓系综合征

正常孕妇在分娩过程中，宫缩持续时间长，间歇时间短，宫口全开，出现大汗淋漓，腰骶酸痛，小腿肌肉痉挛等表现，称为

A．第一产程
B．胎盘娩出期
C．胎儿娩出期
D．宫颈扩张期
E．第三产程