The general idea of the last paragraph of this passage is______.
A. heat at earth's core
B. causes of volcanoes
C. roles of pressure
D. formation of volcanoes at earth's surface
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Microsoft may harbor a grudge against Google because
A. the latter's free platform. impairs the benefit of the former.
B. the two companies compete for similar operating systems.
C. the latter is ambitious and eager to develop new applications.
D. the latter poses a threat to the monopoly of Windows system.
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
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
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