单项选择题

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单项选择题
______ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.
A. Even
B. But
C. Although
D. So
单项选择题
The computer can be programmed to ______ a whole variety of tasks.
A. assign
B. tackle
C. realize
D. solve
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