题目内容
Jack is __________ honest boy and he never tells a lie．
A．× B．the C．a D．an
D
三新快车金牌周周练系列答案By using less energy, you can reduce pollution that causes global （全球的） warming, An energy-saving light bulb （灯泡） uses less energy to produce the same amount of light as a regular bulb, Use the chart to compare a regular bulb with an energy-saving bulb．
| Regular Light Bulb | Energy-Saving Light Bulb | |
| Name | Incandescent light bulb | Compact fluorescent light bulb（CFL），energy saver |
| Price | 50 cents | $5 |
| Cost of energy | Used in one year （4 hours a day）：$9.3 | Used in one year（4 hours a day）：$2.5 |
| Energy used | 75 watts（Most of this energy is wasted as heat．） | 20 watts |
| Lifetime | 1.000 hours | 10,000 hours |
（ ） 1．How much more energy does the regular bulb use than the CFL bulb if they are used for a year （four hours every day）?
A．75 watts. B．55 watts. C．20 watts. D．50 watts.
（ ） 2．How many regular bulbs does a CFL bulb equal （等同于） in lifetime?
A．1 B．5. C．10. D．20.
（ ） 3．I bought a regular bulb and Tom bought a CFL bulb．If we both used the bulb for four hours a day, how much money would Tom save in all after a year?
A．$ 2.3. B．$ 90.5. C．$ 6.8. D．$ 95.5.
（ ） 4．Why do regular light bulbs use so much energy?
A．They make more light than CFL bulbs.
B．They can be used for a longer time than CFL bulbs.
C．They waste most of their energy as heat.
D．It's because of their shapes.
（ ） 5．What does the writer try to tell us according to the passage?
A．Using more energy can produce less pollution.
B．Energy-saving light bulbs are cheaper than regular ones in shops.
C．It is a good idea to use energy-saving CFL bulbs instead of regular ones.
D．An energy-saving light bulb is easier to get broken.