Câu hỏi:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks    

 

 While many behaviors and practices associated with going green are designed to save money, there are certain ways in which green living can actually be moderately to very expensive. (19) ________ of the technology associated with green living provides benefits to the environment but often at a much higher cost than their traditional counterparts. For instance, the use of solar panels can potentially save you money on your energy bills, but they can (20) ______________ thousands of dollars to install. Energy-efficient appliances are designed to use less electricity and water but they often come with a high price tag.     Going green can also potentially have a negative effect on the environment. (21) ___________, the development of alternative fuels is an innovation in the green movement in an effort to reduce reliance on nonrenewable (22) ________ resources. While these fuels are intended to reduce the toxic emissions caused by the burning of traditional gasoline, they may have unintentionally caused the opposite effect. One of these alternative fuels, E85, actually gives off more ozone into the atmosphere than traditional fuel. While ozone is a natural part of the Earth’s upper atmosphere, if it becomes concentrated in the lower atmosphere, it can potentially increase air pollution in areas where smog is a concern, (23) ________ can in turn impact the health of those living in these areas.

 (19) ________ of the technology associated with green living provides benefits to the environment but often at a much higher cost than their traditional counterparts.