What does the word HESITATE in the first paragraph mean?

1.         What does the word HESITATE in the first paragraph mean?           

• crash

• be uncertain

• stop

• be fast

2.         How long ago did human know about electricity? 

• more than twenty years ago

• more than two hundred years ago

• more than two thousand years ago

• more than two million years ago

3.         From the sentence: “All living cells sent out tiny pulses of electricity”, we can infer 

• Electric pulses of animals are dangerous for themselves

• Very tiny animals like mosquitoes do not have

• A dead elephant still have electric pulses

• A fly has pulses of electricity

4. The word “astonishing” can be replaced by …… 

• surprising

• small

• strong

• weak

5. The phrase “four fifths” means ….

• 45

• 54

• 4/5

• 5/4

6. What is the main idea of the passage? 

• Electric eels are potentially dangerous

• Biology and electricity appear to be closely related

• People would be at a loss without electricity

• Scientists still have much to discover about electricity

7. The author mentions all of the following as results of a blackout EXCEPT    

• refrigerated food items may go bad

• traffic lights do not work

• people must rely on candlelight

• elevators and escalators do not function

8. Why does the author mention electric eels?   

• To warn the reader to stay away from them

• To compare their voltage to that used in houses

• To give an example of a living electrical generator

• To describe a new source of electrical power

9. How many volts of electricity can an electric eel emit?  

• 1,000

• 800

• 200

• 120

10. It can be inferred from the passage that the longer an eel is the  

• more beneficial it will be to science

• more powerful will be its electrical charge

• easier it will be to find

• tougher it will be to eat