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
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单项选择题
Britain's press is unusual ______ it is divided into two very different types of newspaper: the quality press and the popular press.
A．in how
B．in what
C．in which
D．in that
单项选择题
Children are ______ to have some accidents as they grow up.
A．obvious
B．indispensable
C．bound
D．doubtless
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