Which of the following is the major factor that affects the accuracy of potassium dating？
A. the number of the mineral pores
B. the number of missing argon atoms
C. external temperature
D. mineral temperature
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According to the passage, which of the following is closest in meaning to the concept "music" in Plato's philosophy？
A. muses
B. culture
C. manners
D. literature
The underlined word "cosmic" in the last paragraph is closest in meaning to ______.
A. radioactive
B. organic
C. terrestrial
D. universal
What aspect of rubidium decay is useful for dating？
A. The atom produced by the decay is above a certain point of temperature.
B. The atom produced by the decay is easy to be detected at a cool temperature.
C. The decay produced a. neutron and an electron.
D. The decay is sensitive to the changes in temperature.
All of the following are mentioned as a capability of technological media EXCEPT their ability to ______.
A. make it easier for students to obtain needed information
B. provide many ways of teaching the same thing
C. make learning easy and fun
D. replace traditional reports
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