单项选择题

_________ research is being done into the connection between the disease and poor living conditions.

A．Intensive
B．Expansive
C．Expensive
D．Extensive
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单项选择题
High corporate leaders seem to be _________ promoting diversity so as to be competitive in the world market.
A．in relation to
B．in favor of
C．in contrast to
D．in excess of
单项选择题
They argued for a long time over what he should pay, but finally struck a _________.
A．negotiation
B．debate
C．bargain
D．dispute,
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