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举一反三
【单选题】Cleaning clothes usually requires soap and water to remove stains and smells, and a tumble in the dryer or an afternoon on the clothesline to dry. The time and energy needed to turn a heap of dirty la...
A.
being exposed only to ultraviolet light
B.
being exposed to sunlight for a few hours
C.
being hung in high-temperature environments
D.
being soaked in a mixture of chemicals
【单选题】Cleaning clothes usually requires soap and water to remove stains and smells, and a tumble in the dryer or an afternoon on the clothesline to dry. The time and energy needed to turn a heap of dirty la...
A.
is based on previous studies
B.
is pioneer work in a new field
C.
poses a challenge to other scientists
D.
has caused a debate among scientists