Questions 1 to 10 are based on the following passage. Did you know that cars and light trucks in the United States emit more carbon dioxide than any other country except China, Russia, and Japan? Furthermore, motor ___1__ are a significant source of air pollutants that cause smog and unhealthy air conditions in our cities and counties. It ’ s no wonder that highly __2___ hybrid ( 混合物 ) electric vehicles (HEVs) are being chosen by governments and __3___ around the country to improve air quality, reduce ___4__ on imported oil, and set an example of environmental stewardship ( 管家的职责 ) in their communities. They ’ re good for the environment, but are they going to be more troublesome than __5___ vehicles? The answer is, no! Though they do rely on a battery for some of their power, HEVs don ’ t need to be plugged in and don ’ t __6___ special fuel. Also, since the combustion ( 燃烧 ) engine receives less wear, these vehicles last longer and may require less ___7__. While the initial price of HEVs is somewhat higher than conventional cars, that premium ( 额外费用 ) is __8___ offset by lower fuel costs and higher resale values — hybrids a good value over the lifetime of a vehicle. “ Hybrid vehicles save consumers money, __9___ as fuel prices continue to be rising, and __10__ America ’ s energy security by our nation less dependent on foreign oil, ” said Kathleen McGinty from Pennsylvania Department of Environmental Protection. A) conventional B) vehicles C) generally D) efficient E) dependence F) especially G) enhance H) businesses I) confidential J) require K) retire L) sufficient M) depression N) maintenance O) specially