On warm summer days with little or no wind, the air temperature in cities can be up to ten degrees higher than that of the surrounding countryside. This is a phenomenon commonly referred to as the “urban heat island” effect.
This phenomenon happens when pavement, buildings, and other infrastructure (基础设施) replace natural land cover.
Large amounts of paved and dark colored surfaces—such as roofs, roads, and parking lots—absorb, rather than reflect, the sun’s heat, causing surface temperatures and overall ambient (周围的) air temperature to rise. Unlike soil, paved areas contribute to runoff, which means that as paved areas increase, the amount of water available for evaporation (蒸发) decreases. Moreover, urban areas have fewer trees and less natural vegetation which help to control the heat by providing shade and blocking solar radiation. The surfaces of leaves also provide water for evaporation which cools the air, further worsening the heat island effect.
In particular, during summer, more energy is required to cool the insides of building and for refrigeration, thereby creating additional heat output. This in turn leads to higher ambient air temperatures, which can also significantly increase the formation of urban smog in an area,
degrading local air quality. Such a situation may directly affect public health with individuals more likely to suffer from heat exhaustion and the effects of asthma (哮喘).
【小题1】The underlined part in Paragraph 2 means ________.
| A．Due to dark colored roads, urban areas are becoming hotter each year |
| B．Dark colored surfaces reflect the sun’s heat, causing air temperatures to rise |
| C．Because urban surfaces absorb heat, air and surface temperatures increase |
| D．Rising ambient air temperatures lead to urban surfaces absorbing more heat |
【小题2】Which of the following is not a cause of the urban heat island effect?
| A．The lack of trees |
| B．The demand for refrigeration |
| C．The blocking of solar radiation |
| D．The construction of infrastructure. |
【小题3】The underlined word “degrading” most probably means ________.
| A．ignoring | B．improving |
| C．highlighting | D．worsening |
【小题4】The passage is mainly developed by ________.
| A．giving typical examples |
| B．following the time order |
| C．presenting the effect and analyzing the cause |
| D．analyzing a problem and seeking the solution |
