单项选择题

From the information given in the passage, most minerals would melt fastest _____________.

A．at 4,000°F, 5,000 feet below sea level
B．in the absence of oxygen
C．at 4,000°F, 5,000 feet above sea level
D．at the exact center of the earth at 4,000°F

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单项选择题

The subject of this passage is the _____________.

A．interior of the earth
B．results of volcanic action
C．work of geologists
D．formation of volcanoes

单项选择题

The main idea of the passage is about ___________.

A．the trends of the 1990s in computer industry
B．the accelerating demands for software and service
C．computers industry's close link with auto-industry
D．the trends in the peripherals arena in the next decade