The main idea of this passage is the______.
A. interior of the earth
B. formation of volcanoes
C. results of volcanic action
D. work of geologists
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A domestic robot differs from an industrial one in that it______.
A. will be much more effective
B. will be more intellectual
C. will be automatically controlled
D. will be more energy-saving
From the information given in the passage, most minerals would melt fastest______.
A. at 4 000 F. , at sea level
B. at 4 000 F. , 5 000 feet below sea level
C. at 4 000 F. , 5 000 feet above sea level
D. in the absence of oxygen
At 5:30 pm on ______, you can telephone the museum for information.
A. Sunday
B. Saturday
C. Monday
D. Sunday and Saturday
According to the passage, people______.
A. can not work better in a noisy situation
B. will suffer from complete deafness because of noise pollution
C. can be psychologically affected by working in very noisy factories
D. may cooperate well in a noisy surrounding
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