单项选择题

Scientists use observation and experimentation to examine a specific concept （） existing theories and principles.

A. in the light of
B. in view of
C. as to
D. in the interest of

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单项选择题
Obviously, no teacher has （） patience. Even Larry, who is always kind and tolerant, lost his temper on that particular occasion.

A. definite
B. spectacular
C. infinite
D. composed
单项选择题
After a number of disagreements with the committee, the chairman decided to （） his present job.

A. retire
B. resign
C. retreat
D. withdraw
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