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
单项选择题
The paragraphs following the passage most likely discuss which of the following
A．The remaining layers of the Sun.
B．The evolution of the Sun to its present form.
C．The eclipse of February 1979.
D．The scientists who study astronomy.
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