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[单选题]
Scientists are working on new fuels to find()that burns more cleanly than gas.
A.everything
B.one
C.anything
D.some
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A.everything
B.one
C.anything
D.some
ay to discover truth.
A.ln case of
B.Regardless of
C.ln the event of
D.Despite of
A.announced
B.appeared
C.appealed
D.approached
A.state
B.volume
C.shape
D.purpose
A.versions
B.volumes
C.editions
D.issues
A.comment
B.commence
C.command
D.commute
A.for
B.beyond
C.within
D.by
A.stick to
B.come up with
C.carry out
D.lead to
A.challenged
B.classified
C.commented
D.calculated
A.associating
B.attaching
C.assisting
D.applying