单项选择题

A．John has lost something at the railway station
B．There are several railway stations in the city
C．It will be very difficult for them to find John
D．The train that John is taking will arrive soon
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单项选择题
The potential for hazardous weeds developing from genetically-modified plants is greatest for ______.
A．agricultural crops grown for their content
B．crops’’ that are closely related to their weeds
C．areas in which cross-breeding is kept to a minimum
D．crops who rely on herbicides and pesticides for effective harvests
问答题
With tears on her face, the lady________ (看着她受伤的儿子被送进手术室).
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