单项选择题

The ability to zoom （） is particularly useful when you are working on detailed diagrams.

A.out
B.in
C.on
D.up

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单项选择题

In other words, all mammals, （） their size, breathe once every four heartbeats.

A.regardless
B.however
C.whatever
D.according

单项选择题

Many people prefer to have their tax forms completed by a professional rather than（） it themselves.

A.doing
B.do
C.to do
D.did

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