单选题
The Robogat is designed to pump water ______.
A、
at a speed of 500 liters a minute
B、
almost as fast as an airport tender
C、
six times faster than an ordinary fire-engine
D、
at a rate of an airport fire tender
【正确答案】
D
【答案解析】
根据第二段第三句It is capable of pumping 3，000 liters of high-pressure water per minute--about the same rate as that from an airport fire tender，可直接得出答案为选项D。
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