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原创精品资源学科网独家享有版权,侵权必究! 2
Test 2
Directions: Fill in each blank with a proper word chosen from the box. Each
word can be used only once. Note that there is one word more than you need.
A
A.efficiency B.employ C.effective D.chemicals E.accelerating
F.existing G.projected H.trapped I.power J.simultaneously K.artificially
This past July was the hottest recorded month in human history. Heat waves smashed temperature records
worldwide and even brought summer temperatures to Chile and Argentina during the Southern Hemisphere’s
winter. It’s more than just a matter of sweaty discomfort. In the U.S. alone, it kills more people each year than
floods, tornadoes and hurricanes combined. As climate change worsens, access to 1 cooled spaces is
rapidly becoming a health necessity.
Yet standard air-conditioning systems have 2 us in a vicious cycle: the hotter it is, the more people
use the AC—and the more energy is used as a result. Nicole Miranda, an engineer researching sustainable cooling
at the University of Oxford says: “it’s not only a vicious cycle, but it’s a(n) 3 one.” According to 2018
data from the International Energy Agency (IEA), the worldwide annual energy demand from cooling is 4
to more than triple by 2050.
It’s becoming increasingly clear that humans cannot outrun climate change with the same air-conditioning
technology we’ve been using. One well-known problem with current AC systems is their reliance on refrigerant
5 , many of which are potential greenhouse gases. About 80 percent of a standard AC unit’s climate-warming
emissions currently come from the energy used to 6 it, says Nihar Shah, director of the Global Cooling
Efficiency Program at Lawrence Berkeley National Laboratory.
Standard air-conditioning systems 7 cool and dehumidify through a relatively inefficient
mechanism: in order to condense water out of the air, they overcool that air past the point of comfort. Many