第1题
A.Tidal waves are caused by underwater earthquake,but tides are not.
B.Tidal waves have regular rise and fall,but tides have not.
C.Tidal waves can be prevented,but tides can not.
D.Tidal waves can hit the land,but tides can not.
第2题
A.They occur at regular intervals.
B.They can withstand great heat.
C.They travel through the Earth"s interior.
D.They can record the Earth"s internal temperature.
第3题
A.Effect of the moon’s gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
第4题
A.30 nautical miles
B.600 nautical miles
C.150 nautical miles
D.1200 nautical miles
第5题
A.30 nautical miles
B.600 nautical miles
C.150 nautical miles
D.1200 nautical miles
第6题
A.Five extinction waves in the history.
B.The Permian and the Cretaceous event.
C.An errant asteroid and some volcanoes.
D.The human beings.
第7题
A.Optimistic.
B.Indifferent.
C.Pessimistic.
D.Critical.
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