The earth is faced with the serious power problem now and all of us are affected by it. Let us look at how we can save power.

　　Computer: More often than not, we do not turn off our monitors(显示屏) even after we have shut down our computers. And we often leave the computers on when we walk away to do something else. Keep the monitor and the computer off when you are not using them. You will help save power.

　　Air Conditioner: Set the air conditioner at the lowest or highest temperature that you are comfortable with, depending on the season. Try not to set it at too-high or toolow temperatures. This helps you save lots of power.

　　Washing Machine: Do you use your washing machine frequently? Do you use it even when there are not many clothes to wash? Reduce the times of washing by washing plenty of clothes every time.

　　Television: Please unplug the power plug of your television set when not using it. This may not sound like a big deal but this little step will help you save power.

　　Refrigerator: Do you always put hot food into the refrigerator? Cool cooked food to the room temperature before placing it into the refrigerator. You can also take cold or frozen food out of the icebox long before the mealtime, so you can heat it with less power.

　　问题：

　　1.When should we turn off our monitors?

　　A.When we are doing something else.

　　B.When we have shut down our computers.

　　C.When we are not using them.

　　D.All of the above.

　　【参考答案】D

　　[考点]事实细节题

　　【精析】D 根据第二段内容可知，在我们关闭计算机以后、在做其他事情时和不用计算机的时候，都应关闭显示屏。故选D。

　　2. The underlined word “This” in the third paragraph refers to _____ .

　　A.stopping using air conditioners

　　B.setting air conditioners at proper temperatures

　　C.using smaller air conditioners

　　D.keeping air conditioners on for a shorter time

　　【参考答案】B

　　[考点]词语理解题

　　【精析】B 根据第三段最后两句“Try not to set it at too-high or too-low temperatures. This helps you save lots of power.”可知，尽量不要将空调设置在太高或太低的温度，这帮助你节省大量电力。This指代的是上文中的not to set it at too-high or too-low temperatures，即把空调设置在合适的温度。故选B。

　　3.According to the writer, we'd better_____ .

　　A.wash our clothes as often as we wish

　　B.wash our clothes without using washing machines

　　C.wash plenty of clothes at a time

　　D.use washing machines to wash light clothes

　　【参考答案】C[考点]事实细节题 【精析】C 根据第四段最后一句“Reduce the times of washing by washing plenty of clothes every time.”可知，作者建议我们通过每次清洗大量衣服来减少洗涤次数，从而节省电力。故选C。

　　4.The writer mentions _____ways of saving power in this passage.

　　A.3

　　B.4

　　C.5

　　D.6

　　【参考答案】D

　　[考点]推理判断题

　　【精析】D 通读全文可知，作者提到了关闭计算机及显示屏、把空调设置在合适的温度、用洗衣机一次清洗大量衣服、拔掉电视机的电源插头、不要把热的食物放进冰箱以及在就餐时间很久之前把食物从冰箱中拿出这六种节省电力的方法。故选D。

　　5.The passage is mainly talking about _____.

　　A.how to live green

　　B.how to buy electrical products

　　C.how to be safe at home

　　D.how to make money

　　【参考答案】A

　　[考点]主旨大意题

　　【精析】A 通读全文可知，文章主要介绍了六种节省电力的方法，旨在告诉我们如何环保生活。B项(如何购买电器产品)、C项(如何安全在家)和D项(如何赚钱)均不符合题意。故选A。