单项选择题

The U.S., generally acknowledged to be a step __ Britain on biofuel, has an estimated 600 stations that offer E85 (a fuel made of 85 percent bioethanol).

A．in excess of
B．in advance
C． ahead of
D．in front of
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单项选择题
America's early __ were attracted by the fertile land and varied climates it offered for farming.
A．settlers
B．inherents
C．residents
D．lodgers
单项选择题
I am unable to __ what he is saying.
A．concentrate on
B．concentrate in
C．finish with
D．finish off
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