20. Environmental………….is a serious problem.
A. polluted B. polluting C. pollute D. pollution
II. Read the following passage then choose the best answer for each question.
In Western countries, electricity, gas, and water are not luxuries but necessities. Companies now
realize that consumers want products that will not only work effectively, but also save money.
For most North American households, lighting accounts for 10 percent to 15 percent of the
electricity bill. However, this amount can be reduced by replacing an ordinary 100-watt light bulb
with an energy- saving bulb. These bulbs use a quarter of the electricity of standard bulbs and last
eight times longer. Therefore, consumers can save about US$7 to US$21 per bulb.
In Europe, there is a labeling scheme for refrigerators, freezers, washing machines, and
tumble dryers. The label tells the consumers how much energy efficiency each model has.
Ultimately, these innovations will save money as well as conserve the Earth
’s resources.
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