单项选择题

Indeed, almost every scientist now finds it impossible to read all the works relevant to his own subject, ______ extensively outside of it.

A．much more to read
B．much less to read
C．much less reading
D．still more reading
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The supermarket is ______ until 9:30 P. M.
A．opening
B．opened
C．open
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There is supposed to be a safety ______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
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