单项选择题

The most serious block to concentration is the ______ which comes not from outside but from within.

A．intermission
B．involvement
C．interruption
D．intervention
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单项选择题
Sometimes doctors have to base a diagnosis on ______ as much as on scientific tests.
A．conception
B．perception
C．intuition
D．cognition
单项选择题
Techniques such as object-oriented design and structured programming will have to be followed to ______ to engineering practice.
A．conform
B．appeal
C．refer
D．tumble
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