单项选择题

______ market research has shown that most Americans prefer environmentally-friendly products.

A．Nasty
B．Neat
C．Preliminary
D．Prior
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单项选择题
Rachel left the office and ran out on to Diana, ______ a taxi to take her home.
A．howling
B．hailing
C．hauling
D．hurling
单项选择题
The tragedy could have been ______ if the crew had followed safety procedures,
A．interfered
B．averted
C．intervened
D．distracted
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