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

What is the main topic of the passage?
A.how to live sensitively to the environment.
B.how to reduce garbage disposal
C.what people often understand about the term 'recycle'
D.what is involved in the recycling movement

Exercise 2: Choose the odd one out.

A.recycle
B.reuse
C.reorder
D.reduce

Exercise 2: Choose the odd one out.

A.polluted
B.charity
C.refillable
D.reusable

Exercise 2: Choose the odd one out.

A.noise
B.bottle
C.can
D.bulb