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.
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单项选择题
A．By using satellite images, maps, etc.B．By studying specific {arming methods.C．By studying the variation of human population.D．By analyzing the quality of crops.
A．By using satellite images, maps, etc.
B．By studying specific {arming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
单项选择题
A．He’s taking a break from studying.B．He has already finished studying.C．He was assigned to watch a program by his professor.D．He’s finding out some information for a friend.
A．He’s taking a break from studying.
B．He has already finished studying.
C．He was assigned to watch a program by his professor.
D．He’s finding out some information for a friend.
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