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Do you know that some animals can produce
electricity? ___1___ are many
varieties of catfish and eels that can ___2___ out low
voltage electric currents
___3___ their bodies. Contrary to what some
___4___ believe,
the
currents ___5___ they produce are
___6___ weak to kill a
person, but
they ___7___ the fish to survive in the sea. Electricity-producing fishes usually have poorly
developed ___8___
They cannot see well and so ___9___ this extraordinary
ability as a
___10___ of protection and as a
___11___ of getting food
for themselves. ___12___ the fish's electric field is
distorted by the
___13___ of a foreign object, the fish
___14___ immediately
alerted. It then produces electricity ___15___ a
reaction. If the foreign
object ___16___ to be a potential predator, it
___17___ the
fish
sufficient time to ___18___ its escape while the enemy
is temporarily
immobilized ___19___ the shock. If it is a smaller fish,
its next ___20___ is assured.
Perhaps one day, we can learn to tap the energy of
such fishes and rear a tankful of them to light our
homes! |
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| Answers |
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| 1.
There
2. give 3. from 4. people
5. that 6. too 7.
help 8.
eyesight 9. need 10. form 11.
means 12. Whenever 13.
presence 14. is 15. as 16.
happens
17. gives 18. make 19. by
20. meal |
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Do you know that some animals can produce
electricity? There are many
varieties of catfish and eels that can
give out low
voltage electric currents
from their bodies. Contrary to what some
people believe,
the
currents that they produce are
too weak to kill a
person, but
they help the fish to survive in the sea. Electricity-producing fishes usually have poorly
developed eyesight.
They cannot see well and so
need this extraordinary
ability as a
form of protection and as a
means of getting food
for themselves. Whenever the fish's electric field is
distorted by the
presence of a foreign object, the fish
is immediately
alerted. It then produces electricity
as a
reaction. If the foreign
object happens to be a potential predator, it
gives the
fish
sufficient time to make its escape while the enemy
is temporarily
immobilized by the shock. If it is a smaller fish,
its next meal is assured.
Perhaps one day, we can learn to tap the energy of
such fishes and rear a tankful of them to light our
homes! |
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