单项选择题

The cause for the heat in the interior of the earth is _____________.

A．not determined
B．the great pressure of the earth
C．radioactive elements
D．the heat remaining from the formation of the earth
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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
单项选择题
Which one of the following is NOT included in the trends of the 1990s
A．Vendors should lay great importance on service.
B．Hardware will account for a greater share of computer companies' revenue.
C．Trends of the 1990s in computer industry are difficult to predict.
D．Manufactures of monitors and printers will expand their business to automobile industry.
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