单项选择题

A．Because IBM is changing its computer models continuously.
B．Because it wants to make its machines specialize in specific uses.
C．Because it wants to stay ahead of IBM in the competitive computer market.
D．Because it expects its major competitor IBM to follow its example,
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单项选择题
A．It is OK to pay with the ID card.B．It is OK to pay with the cash.C．It is OK to pay with the credit card.D．He doesn’t need to pay.
A．It is OK to pay with the ID card.
B．It is OK to pay with the cash.
C．It is OK to pay with the credit card.
D．He doesn’t need to pay.
单项选择题
A．Serious water pollution in the future.B．People’s increasing demand for water.C．Agriculture and its relation with water pollution.D．Water problems and measures taken to solve it.
A．Serious water pollution in the future.
B．People’s increasing demand for water.
C．Agriculture and its relation with water pollution.
D．Water problems and measures taken to solve it.
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