单项选择题

A. Now he understands the system.
B. He has no use for technology.
C. He has to do some calculations.
D. He doesn’t know how to operate the computer.
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单项选择题
A. The oxygen level in the water. B. The angle of the treadmill. C. The weights on the divers. D. The temperature of the water.
A. The oxygen level in the water.
B. The angle of the treadmill.
C. The weights on the divers.
D. The temperature of the water.
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