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

Exercise 3: Choose the best option A, B, C or D.
If we all use …………… bags, we will help the environment.
A.new
B.reusable
C.cheap
D.reduced

Exercise 3: Choose the best option A, B, C or D.
This newspaper is made of ……………… paper.
A.recycle
B.old
C.recycled
D.waste