Why is fish eating forbidden in Utopia？
A. To secure the balance of nature.
B. To exercise people's perseverance.
C. For a strong volition.
D. For excellent health condition.
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We can infer from the passage that the music "Lydian" sounds ______.
A. sad
B. bold
C. relaxed
D. simple
What is the limitation of the rubidium method？
A. Rubidium is everywhere in the rock.
B. Strontium atoms are hard to detect at the normal temperature.
C. It cannot date sediments.
D. It is time-consuming.
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
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
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