单项选择题

They have been ______ that company for many years.

A．comparing with
B．dealing with
C．keeping up with
D．combining with
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单项选择题
The author raises issues that would most concern which of the following groups
A．Electricians.
B．Environmentalists.
C．Aircraft pilots.
D．Teachers.
单项选择题
The main purpose of the passage is to ______.
A．compare skyscrapers with other modem structures
B．describe skyscrapers and their effect on the environment
C．support the use of stone in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers
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