28. Why arent all bottles now made of polyester?
A. The price of oil and plastic has risen.
B. It is not suitable for containing gassy drinks.
C. The public like traditional glass bottles.
D. Shop-keepers dislike reusable bottles.
29. Manufacturers think polyester bottles are better than glass bottles because they
A. are cheaper B. are more suited to small sizes
C. are more exciting to look at D. do not break easily
30. Plastic containers for holding food in the same way as cans______.
A. have been used for many years
B. are an idea that interests the plastics companies
C. are possible, but only for hot food
D. are the first things being made in the new factories
26. C 27. A 28. C 29. D 30. B
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