(C) Consider this: around half of the world’s clothing is made from cotton. Yet the process required to turn cotton into clothing has a major __20__ on the environment, especially in the developing world. __21__, over 20,000 liters of water might be needed to produce a single kilogram of cotton. __22__, the chemicals used to protect crops from insects cause pollution and health problems for workers.      For these reasons, people have been coming up with cotton __23__. One idea is to use banana stems. Waste from this top part of the banana skin __24__ about one billion tons each year. However, studies show that just 37 kilograms can create one kilogram of usable fiber. Material produced from banana stems has a soft feel, making it ideal for jackets, shirts, and pants. Not only that, but its production __25__ almost no carbon footprint at all!
【題組】20
(A) harm
(B) risk
(C) shift
(D)impact