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问题 选择题

   – Will it rain tomorrow?

-- No. I don’t doubt ________.

A．whether it will rain

B．that it will rain

C．whether it rains

D．that it rains

答案

答案：B

单项选择题

Both bus and tree topologies are characterized by the use of multipoint （） . For the bus, all stations attach, through appropriate hardware （） known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received fromthe （） . A transmission from any station propagates the length of the medium in both directions and can be received by all other （） . At each end of the bus is a （） , which absorbs any signal, removing it from the bus.

Both bus and tree topologies are characterized by the use of multipoint（）.

A．medium

B．connection

C．token

D．resource
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判断题

我国森林覆盖率只有世界平均值的四分之一。
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