I began to smoke when I was in high
school. My parents didn’t care much, They both smoked, and my older brother did,
too. In school, the teachers talked against smoking, but the cigarette
advertisements were so exciting. The men in the ads were so good-looking and so
successful, and the women were well, they were beautiful and
sophisticated. I read a book called how to stop smoking. The writer said that smoking wastes time, and that cigarettes cost a lot of money. Ten years later, everyone began to hear about file negative effects of cigarette smoke: lung disease, cancer, and heart problems. After that, there was a health warning on every pack of cigarettes. Then two events made me think of giving up smoking. First, I started to cough. I thought it was just a cold, but it didn’t get better. Second, my brother got lung cancer. He got s A. He started to cough. B. He got lung cancer. C. He tried to give up smoking but failed. D. He regretted smoking in high school. [单项选择] In 1983, when oil process were till high in my area, I installed a ground-source heat pump in my brand-new, and insulated 1,600-square-foot house. It cost several thousand dollars more than comparable systems that use oil, gas, or wood, but I figured I’’d recover my higher initial expense in a few years through lower energy bills.
True, my heat pump runs on electricity-an expensive commodity where I live. But most of its energy comes from the earth: a propylene-glycol solution circulates through 1,200 feet of two-inch-diameter plastic pipe buried three feet deep in a field next to my house. As it travels, the solution absorbs heat from the surrounding soil, even when soil temperature drops below freezing.
My ground-source heat pump also offers important benefits that have nothing to do with economics.
*Minimal fire hazard-no chimney, firebox, or heating elements-only pumps, fans, and a compressor.
*Cleanliness-no combustion products, thus no chance of my heating syst
A. uses no electricity B. has a fire-safety shutoff C. does not pollute the air in the house D. pollute the air in house 我来回答: 提交
|