单项选择题

A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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单项选择题
A．Because it serves only a few specialties.B．Because it’’s too crowded.C．Because it’’s too costly.D．Because the service is too slow.
A．Because it serves only a few specialties.
B．Because it’’s too crowded.
C．Because it’’s too costly.
D．Because the service is too slow.
单项选择题
A．The ice was cut and handled with the help of some special tools.B．The ice was taken from the flowing river with hooks and carried by sleds to icehouses.C．The ice was carried on the frozen surface of the pond or river.D．The ice was sawed into even blocks by workers.
A．The ice was cut and handled with the help of some special tools.
B．The ice was taken from the flowing river with hooks and carried by sleds to icehouses.
C．The ice was carried on the frozen surface of the pond or river.
D．The ice was sawed into even blocks by workers.
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