关于PPP协议LCP协商过程，以下描述错误的是（）.A.当对方发送报文的协议域错误时

刘谦的魔术风靡全国，现刘谦背对小亮，让小亮按下列四个步骤操作：第一步分发左、中、右三堆牌，每堆牌不少于两张，且各堆牌的张数相同；第二步从左边一堆拿出两张，放入中间一堆；第三步从右边一堆拿出一张，放入中间一堆；第四步左边一堆有几张牌，就从中间一堆拿几张牌放入左边一堆．这时刘谦准确地说出了中间一堆牌现有的张数，请你用所学的知识确定中间牌的张数是[ ]

A．4

B．5

C．6

D．7

滤油器的过滤精度常用（）作为尺寸单位。

A．μm

B．mm

C．nm

D．mm²

.

Do you want to live another 100 years or more? Some experts say that scientific advances will

one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.

“ I think we are knocking at the door of immortality (永生),” said Michael Zey, a Montclair State University business professor and author of two books on the future. “ I think by 2075 we will see it and that’s a conservative estimate.”

At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology(纳米技术) make it likely that humans will live in the future beyond what has been possible in the past. “ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”

However, many scientists who specialize in aging are doubtful about it and say the human body is just not designed to last about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.

Scientists also differ on what kind of life the super aged might live. “ It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life?” said Leonard Poon, director of the University of Georgia Gerontology Center. “ At present people who could get to that point are not in good health at all.”

67. By saying “ we are knocking at the door immortality”, Michael Zey means_____.

A. they believe that there is no limit of living

B. they are sure to find the truth about long living

C. they have got some ideas about living forever

D. they are able to make people live past the present life span

68. Donald Louria’s attitude toward long living is that_____.

A. people can live from 120 to 180

B. it is still doubtful how long humans can live

C. the human body is designed to last about 120 years

D. it is possible for humans to live longer in the future

69. The underlined “ it” (Para. 4) refers to_____.

A. a great push

B. the idea of living beyond the present life span

C. the idea of living from 200 to 300

D. the conservative estimate

70. What would be the best title for this text?

A. Living longer or not

B. Science, technology and long living

C. No limit for human life

D. Healthy lifestyle and long living

安装过程中，安装单位的（）。

A.项目经理应当进行现场监督

B.项目经理应当定期巡查

C.专业技术人员应当进行现场监督

D.专职安全生产管理人员应当进行现场监督

E.技术负责人应当定期巡查