Why is it a waste when customers buy low-quality products?
A.Because they produce less energy.
B.Because they have to be repaired many times.
C.Because customers change their ideas all the time.
D.Because people will soon throw them away.

What are the two things mentioned as examples of recycling?
A.Hamburger wrappings and spent motor oil.
B.Aluminum cans and plastic wrappings.
C.Aluminum cans and spent motor oil.
D.TV sets and aluminum cans.

The word “precious” is closest in meaning to_________
A.invaluable
B.substantial
C.natural
D.first

The word inaccessible in line 9 means __________ .
A.extremely small
B.impossible to climb
C.hard to reach
D.difficult to find

It can be inferred from the passage that fiberscopes ___________ .
A.have more uses in industry than in medicine
B.will play a major role in the information age
C.will decrease in importance as they become more common
D.have reached the peak of their development

Approximately how many fibers does a fiberscope contain?
A.500
B.1,000,000
C.25
D.750

The main topic of the passage is ___________ .
A.The birth of the “electronic superhighway”
B.How fiberscopes have enhanced the field of medicine
C.How sound may be transformed into light
D.The various applications of fiber-optic technology

Exercise 3: Choose the best option A, B, C or D.
It is a good idea to …………… our clothes with our friends or cousins.
A.change
B.turn
C.swap
D.send

Exercise 3: Choose the best option A, B, C or D.
If people turn off all electric appliances in one hour all over the world, they can save lots of ………….. .
A.electric
B.electrician
C.electrical
D.electricity

Exercise 3: Choose the best option A, B, C or D.
Don’t throw rubbish into the river because you will make it ……….. .
A.greener
B.cleaner
C.dirty
D.fresher