用作消毒灭菌的氧化剂有()A．1%高锰酸钾 B．石炭酸 C．新洁尔灭 D．3%过氧化

工程建设定额中所规定的各种劳动与物化劳动消耗量的多少，是由一定时期的社会生产水平所确定的，有一个相对的执行期，地区和部门定额一般在3～5年之间，国家定额在5～10年之间。这体现了工程建设建设定额的（）特征。

A．时效性

B．科学性

C．统一性

D．稳定性

Two scientists in California now think they can find out a person’s real age.Jeffery Bada and Patricia Masters do chemical tests on teeth.When we are born the amino acids（氨基酸）in our teeth are in one form.Then，as we grow older these amino acids change into a second form.Every year，one thousandth of the amino acids changed.So，by testing just one tooth and counting the number of amino acids in each form，Bada and Masters can work out a person’s age.They tested a tooth from the body of an Eskimo（爱斯基摩人）woman who died 1 600 years ago.From the appearance of her body，she was between 50 and 60 years old when she died.The tooth test put her age at 53.Then the Russian Government sent them a tooth from an old man in Georgia.The tooth said she was 99.Her real age was 96.The Russians are now hoping to send more teeth，from the very old people without birth certificates（出生证明书）.But there are problems.Some of the centenarians（百岁老人）have lost all their teeth.The others want to keep their teeth until they drop out naturally.So the Russian Government and the American scientists have to wait and hope.

61.Jeffery Bada and Patricia Masters believe that they can tell a person’s age according to_______.

A.an experiment on his bone

B.the shape and condition of his teeth

C.a test on the amino acids within his body

D.the changing form of amino acids in his teeth

62.According to the passage，which of the following statements is true?

A.The amino acids in an adult’s teeth may differ from those in a baby’s.

B.The number of amino acids in a 20-year-old man is different from that when he was seven.

C.Amino acids in one teeth changes without affecting their forms.

D.Scientists now can tell how long a person will live by testing his teeth.

63.Why are the two scientists asked to find out some very old Russians’ age?

A.Because the Government wants to know how long these old people can live.

B.Because they have no birth certificates.

C.Because people who have tooth problems tend to live longer.

D.Because the Government wants to know their dates of birth and death.

64.In order to find out the exact age of some people over 100，both the Russian Government and American scientists_______.

A.should wait until all of them die

B.should pull out one of their teeth

C.have to wait for their teeth to drop out naturally

D.want to have their teeth pulled out

65.The central idea of the passage is_______.

A.the relationship between people’s teeth and ages

B.the relationship between amino acids and teeth

C.the contradiction（矛盾）between scientists and patients

D.the contradiction between the Government and the scientists

在下列特定穴中治疗脏病一般多用（）

A.合穴

B.络穴

C.俞穴

D.输穴

E.募穴

凹坑状骨吸收指发生于牙齿的（）

A.颊舌面的骨吸收

B.邻面的龈谷下方的谷吸收

C.根尖区的骨吸收

D.其他部位的骨吸收

E.单侧的骨吸收

营业现金净流量与营业现金毛流量之间的差距是由于多占用营业流动资产增加所致。（）