B.close to a slow-flowing river.
C.high in some barren mountains.
D.by a rotating water sprinkler.
4.Some scientists believe that___.
A.watching animals to anticipate earthquakes is more effective than depending on seismography.
B.the unusual behavior of animals cannot be trusted.
C.neither watching nor using seismographs is reliable.
D.earthquake
5.What kind of machine can generate negative ions indoors?
A.Ionisers.
B.Air-conditioners.
C.Exhaust-fans
D.Vacuum pumps.
答案:1.C 2.B 3.D 4.A 5.A
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