559.Scientists are working _____ time in order to find a cure for bird flu as soon as possible.
A.on
B.ahead of
C.around
D.against
560.After the robbery,the shop fixed an alarm system ______ further losses.
A.for
B.against
C.from
D.to
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559.Scientists are working _____ time in order to find a cure for bird flu as soon as possible.
A.on
B.ahead of
C.around
D.against
560.After the robbery,the shop fixed an alarm system ______ further losses.
A.for
B.against
C.from
D.to