单项选择题

It is difficult to ________ the sample that is on the slide unless the microscope is adjusted properly.

A．overlook
B．discern
C．disclaim
D．distract
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单项选择题
There is no reason they should limit how much vitamin you take, ________ they can limit how much water you drink.
A．much more than
B．no more than
C．no less than
D．any more than
单项选择题
________ a week goes by without some educational problem arising.
A．Infrequently
B．Hardly
C．Practically
D．Merely
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