理工类阅读判断考试卷模 拟考试题

1、姓名：_ 班级：_ 学号：_-密-封 -线- 理工类阅读判断考试卷模 拟考试题考试时间：120分钟 考试总分：100分题号一二三四五总分分数遵守考场纪律，维护知识尊严，杜绝违纪行为，确保考试结果公正。1、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happ

2、ened is to discover when it happened.radiocarbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstab

3、le form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a process called decay (衰减). this process involves the loss of he extra neutrons and energy from the nucleus.in libbys radiocarbon dating technique, the weak radioactive emissions (放射) from this decay p

4、rocess are counted by instruments such as a radiation detector and counter. the decay rate is used to determine the proportion of c-14 atoms in the sample being dated.carbon-14 is produced in the earths atmosphere when nitrogen (氮)-14, or n-14,interacts with cosmic rays (宇宙射线). scientists believe si

5、nce the earth was formed, the mount of nitrogen in the atmosphere has remained constant. consequently, c-14 formation is thought to occur at a constant rate. now the ratio of c-14 to other carbon toms in the atmosphere is known. most scientists agree that this ratio is useful for dating items back t

6、o at least 50,000 years.all life on earth is made of organic molecules (分子) that contain carbon atoms coming from the atmosphere. so all living things have about the same ratio of c-14 atoms to other carbon atoms in their tissues (组织). once an organism (有机体) dies it stops taking in carbon in any for

7、m, and the c-14 already present begins to decay. over time the amount of c-14 in the material decreases, and the ratio of c-14 to other carbon atoms goes down. in terms of radiocarbon dating, the fewer c-14 atoms in a sample, the older that sample is.nowadays many scientists depend on radiocarbon fo

8、r dating age-old objects （ ）a.rightb.wrongc.not mentioned2、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happened is to discover when it happened.radioc

9、arbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutro

10、ns. it returns to a more stable form of carbon through a process called decay (衰减). this process involves the loss of he extra neutrons and energy from the nucleus.in libbys radiocarbon dating technique, the weak radioactive emissions (放射) from this decay process are counted by instruments such as a

11、 radiation detector and counter. the decay rate is used to determine the proportion of c-14 atoms in the sample being dated.carbon-14 is produced in the earths atmosphere when nitrogen (氮)-14, or n-14,interacts with cosmic rays (宇宙射线). scientists believe since the earth was formed, the mount of nitr

12、ogen in the atmosphere has remained constant. consequently, c-14 formation is thought to occur at a constant rate. now the ratio of c-14 to other carbon toms in the atmosphere is known. most scientists agree that this ratio is useful for dating items back to at least 50,000 years.all life on earth i

13、s made of organic molecules (分子) that contain carbon atoms coming from the atmosphere. so all living things have about the same ratio of c-14 atoms to other carbon atoms in their tissues (组织). once an organism (有机体) dies it stops taking in carbon in any form, and the c-14 already present begins to d

14、ecay. over time the amount of c-14 in the material decreases, and the ratio of c-14 to other carbon atoms goes down. in terms of radiocarbon dating, the fewer c-14 atoms in a sample, the older that sample is.the radiocarbon dating technique is only about 40 years old（ ）a.rightb.wrongc.not mentioned3

15、、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happened is to discover when it happened.radiocarbon dating was developed in the late 1940s by physicist

16、willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a p

17、rocess called decay (衰减). this process involves the loss of he extra neutrons and energy from the nucleus.in libbys radiocarbon dating technique, the weak radioactive emissions (放射) from this decay process are counted by instruments such as a radiation detector and counter. the decay rate is used to

18、 determine the proportion of c-14 atoms in the sample being dated.carbon-14 is produced in the earths atmosphere when nitrogen (氮)-14, or n-14,interacts with cosmic rays (宇宙射线). scientists believe since the earth was formed, the mount of nitrogen in the atmosphere has remained constant. consequently

19、, c-14 formation is thought to occur at a constant rate. now the ratio of c-14 to other carbon toms in the atmosphere is known. most scientists agree that this ratio is useful for dating items back to at least 50,000 years.all life on earth is made of organic molecules (分子) that contain carbon atoms

20、 coming from the atmosphere. so all living things have about the same ratio of c-14 atoms to other carbon atoms in their tissues (组织). once an organism (有机体) dies it stops taking in carbon in any form, and the c-14 already present begins to decay. over time the amount of c-14 in the material decreas

21、es, and the ratio of c-14 to other carbon atoms goes down. in terms of radiocarbon dating, the fewer c-14 atoms in a sample, the older that sample is.an atom of ordinary carbon has six protons and eight neutrons（ ）a.rightb.wrongc.not mentioned4、radiocarbon datingnowadays scientists can answer many q

22、uestions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happened is to discover when it happened.radiocarbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of

23、 ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a process called decay (衰减). this process involves the loss

24、 of he extra neutrons and energy from the nucleus.in libbys radiocarbon dating technique, the weak radioactive emissions (放射) from this decay process are counted by instruments such as a radiation detector and counter. the decay rate is used to determine the proportion of c-14 atoms in the sample be

25、ing dated.carbon-14 is produced in the earths atmosphere when nitrogen (氮)-14, or n-14,interacts with cosmic rays (宇宙射线). scientists believe since the earth was formed, the mount of nitrogen in the atmosphere has remained constant. consequently, c-14 formation is thought to occur at a constant rate.

26、 now the ratio of c-14 to other carbon toms in the atmosphere is known. most scientists agree that this ratio is useful for dating items back to at least 50,000 years.all life on earth is made of organic molecules (分子) that contain carbon atoms coming from the atmosphere. so all living things have a

27、bout the same ratio of c-14 atoms to other carbon atoms in their tissues (组织). once an organism (有机体) dies it stops taking in carbon in any form, and the c-14 already present begins to decay. over time the amount of c-14 in the material decreases, and the ratio of c-14 to other carbon atoms goes dow

28、n. in terms of radiocarbon dating, the fewer c-14 atoms in a sample, the older that sample is.radar is used to determine the characteristics of radiocarbon. （ ）a.rightb.wrongc.not mentioned5、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called rad

29、iocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happened is to discover when it happened.radiocarbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子

30、) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a process called decay (衰减). this process involves the loss of he extra neutrons and energy from the nucleus.in l

31、ibbys radiocarbon dating technique, the weak radioactive emissions (放射) from this decay process are counted by instruments such as a radiation detector and counter. the decay rate is used to determine the proportion of c-14 atoms in the sample being dated.carbon-14 is produced in the earths atmosphe

32、re when nitrogen (氮)-14, or n-14,interacts with cosmic rays (宇宙射线). scientists believe since the earth was formed, the mount of nitrogen in the atmosphere has remained constant. consequently, c-14 formation is thought to occur at a constant rate. now the ratio of c-14 to other carbon toms in the atm

33、osphere is known. most scientists agree that this ratio is useful for dating items back to at least 50,000 years.all life on earth is made of organic molecules (分子) that contain carbon atoms coming from the atmosphere. so all living things have about the same ratio of c-14 atoms to other carbon atom

34、s in their tissues (组织). once an organism (有机体) dies it stops taking in carbon in any form, and the c-14 already present begins to decay. over time the amount of c-14 in the material decreases, and the ratio of c-14 to other carbon atoms goes down. in terms of radiocarbon dating, the fewer c-14 atom

35、s in a sample, the older that sample is.radiocarbon is reliable in dating an object back to at least 50,000 years.（ ）a.rightb.wrongc.not mentioned6、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one

36、key to understanding how and by something happened is to discover when it happened.radiocarbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核)

37、. carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a process called decay (衰减). this process involves the loss of he extra neutrons and energy from the nucleus.in libbys radiocarbon dating technique, the wea

38、k radioactive emissions (放射) from this decay process are counted by instruments such as a radiation detector and counter. the decay rate is used to determine the proportion of c-14 atoms in the sample being dated.carbon-14 is produced in the earths atmosphere when nitrogen (氮)-14, or n-14,interacts

39、with cosmic rays (宇宙射线). scientists believe since the earth was formed, the mount of nitrogen in the atmosphere has remained constant. consequently, c-14 formation is thought to occur at a constant rate. now the ratio of c-14 to other carbon toms in the atmosphere is known. most scientists agree tha

40、t this ratio is useful for dating items back to at least 50,000 years.all life on earth is made of organic molecules (分子) that contain carbon atoms coming from the atmosphere. so all living things have about the same ratio of c-14 atoms to other carbon atoms in their tissues (组织). once an organism (

41、有机体) dies it stops taking in carbon in any form, and the c-14 already present begins to decay. over time the amount of c-14 in the material decreases, and the ratio of c-14 to other carbon atoms goes down. in terms of radiocarbon dating, the fewer c-14 atoms in a sample, the older that sample is.whe

42、n an organism dies, the c-14 in it begins to decay.（ ）a.rightb.wrongc.not mentioned7、radiocarbon datingnowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), or carbon-14, dating. one key to understanding how and by something happened is to discov

43、er when it happened.radiocarbon dating was developed in the late 1940s by physicist willard f. libby at he university of chicago. an atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons (中子) in its nucleus(原子核). carbon-14, or c-14, is a radioactive, unstable form of carbon that has two extra neutrons. it returns to a more stable form of carbon through a