单项选择题

A small car is more ________ than a large car, because it uses less petrol.

A．economical
B．economic
C．thrifty
D．advantageous
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单项选择题
People always greet each other warmly, _______ their different origins and beliefs.
A．in regard to
B．in contrast with
C．with respect to
D．regardless of
单项选择题
_______ in 1943 _______ the harmful smog made its appearance in Los Angles.
A．Only...that
B．That it was...when
C．It was...then
D．It was...that
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