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A
В
C
Question 29: A. smog
B. layer
C. puddle
D. litter
A
В
C
1
Question 30: A. that
B. where
C. who
D. which
A
В
C
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct
answer to each of the questions from 31 to 35.
Plastic is one of the most common artificial materials used in our daily lives. We store food in plastic
containers, carry groceries in plastic bags and drink out of plastic cups. But did you know that plastic also
plays an important role in the medical industry?
Plastic has caused significant changes in the medical industry by reducing the risk of infection. Before
disposable plastic products existed, hospitals used to boil medical tools to sanitize them. Although this
method worked, there was a danger of infection if the tools were not properly sanitized. However, disposable
products have solved this problem.
Another medical use of plastic is to make artificial joints. Artificial hips and knees are needed by many
older people so that they can continue to walk. In the past, most artificial joints were made of metal. But
plastic has the advantages of weighing less and being easily formed into any shape. Today, many joints are
made from a combination of metal and plastic parts.
Finally, how's your eyesight? If you wear glasses or contact lenses, you can thank plastic for giving
you good eyesight. Today, actual glass isn't used to make eyeglass lenses anymore. Instead, plastic is used.
Plastic
lighter, thinner, less likely to break and harder to scratch.
contact lenses are
made of plastic, too. This makes them more comfortable than those that were made of glass.
While plastic causes some environmental problems, it also brings us many benefits. Without it, our
lives would be much more difficult. In the future, we should continue to enjoy its advantages while finding
ways to lessen its disadvantages.
Question 31: The word "formed" in paragraph 3 is closest in meaning to
B. molded
A. cut
C. frozen
D. melted
A
В
C
Question 32: What is this passage mainly about?
B. harmful health effects of plastic
A. the development of a new kind of plastic
C. why plastic is lighter than metal
D. plastic's role in the medical industry
A
В
C
Question 33: Why is plastic used in artificial joints?
A. Its cost is less than that of other materials. B. It is not likely to cause infections.
C. It is light and its shane can easily be changed. D. It is stronger than other materials
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