4. Up till now, water energy has been used for……….
A. similar purposes B. moving ship
C. the textile industry D. different purposes
Choose A, B, C or D to complete the passage
In Western countries, electricity, gas, and water are not luxuries (5)_ necessities.
Companies now realize that consumers want (6) 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 (7) .
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 (8) of standard bulbs and
last eight times (9)_ _ . Therefore consumers can save about US7 to US21 per bulbs…
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