A.the position is suitable
B.the position is reliable
C.the position is changeable
D.the position is fixable
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A.The two points are in low latitudes in the same hemisphere
B.The two points are in high latitudes in the same hemisphere
C.The two points are near the equator, but in different hemispheres
D.One point is near the equator, one point is in a high latitude, and both are near the 180th meridian
A.gale warning
B.24 hours forecast
C.synopsis
D.storm warning
A.at, to
B.to, from
C.from, to
D.at ,from
A.must be sent
B.be sent
C.would be sent
D.were sent
A.to be
B.being
C.having been
D.to have been
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