单项选择题

Cornwall Research Facility in Salem primarily focuses on lung cancer research ______ treatment.

A. so
B. nor
C. but
D. and
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单项选择题
—What's in the ______ —There are some ______ and ______ in them.
A．photos; potatoes; radios
B．photos; potatoes; radioes
C．photoes; potatos; radios
D．photos; potatos; radios
单项选择题
Alexis ______ her Canadian dollars for RMB before her trip to Beijing.
A．exchange
B．exchanged
C．exchanging
D．exchangeable
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