单项选择题

To have a computer without being connected to the Web is like having an old radio when everybody else has a color TV. That helps explain ______ businesses are setting up Net sites even though profits are nowhere to see.

A．reasons
B．the reason for
C．why
D．why that
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单项选择题
Problems caused by ______ nationality have to be properly coped with.
A．mutual
B．bilateral
C．binary
D．dual
单项选择题
George Ernest Morrison, an Australian, traveled the five-foot roads, or foot paths, from Shanghai to Rangoon in 1894, ______ China before it was engulfed in a century of revolution, war and political tumult.
A．witness
B．witnessed
C．witnessing
D．to witness
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