单项选择题
A.clear B.evident C.obvious D.apparently
A.Expanding circle B.Sector search C.Parallel track pattern D.Datum-drift search
A.Was／would B.Were／would C.Is／will D.Is／is to
A.go in a different direction in search of land B.spread out to increase the possibility of a search aircraft finding you C.reduce the number of rafts by getting as many people as possible into as few rafts as possible D.tie the rafts together and try to stay in a single group
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