A.Because the animals were staying at a higher place in the park. |
B.Because the animals were able to run much faster than human beings. |
C.Because human beings cannot hear the infrasonic sound. |
D.Because the animals might have picked up the danger signals and ran away. |
A.Rayleigh waves are massive vibrational waves that usually cause quakes or tsunamis. |
B.Rayleigh waves move on the ocean surface at a speed ten times that of sound waves. |
C.Rayleigh waves can be felt both by animals and human beings. |
D.Rayleigh waves, just like infrasonic sound, can only be felt by animals. |
A.we can’t feel the infrasound so we can’t be informed of the danger |
B.we can feel Rayleigh waves as well as infrasound so we are able to escape the danger like animals |
C.we were so busy with things on our minds that we feel neither infrasound nor Rayleigh waves |
D.we think nothing of the information of its coming even though we can also get it |
A.Screening out the information. |
B.There being so much going on before our eyes and in our ears. |
C.Having a lot of things on our minds. |
D.Paying attention to the information. |
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