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  3. Electric cars are getting cheaper and their sales are on the rise, but their future success may depend on ditching a key【C1】____

Electric cars are getting cheaper and their sales are on the rise, but their future success may depend on ditching a key【C1】____

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问题     Electric cars are getting cheaper and their sales are on the rise, but their future success may depend on ditching a key【C1】________: the heavy metal cobalt.
    The mineral is used in the lithium-ion batteries that【C2】________most electric cars, and demand for it is【C3】________increasing. A new analysis by Elsa Olivetti at the Massachusetts Institute of Technology and her colleagues has found that there may be cobalt shortages【C4】________ we don’t start refining and recycling it more efficiently or in greater quantities.
    The new analysis suggests short-term cobalt supply is【C5】________,【C6】________that more mining exploration,【C7】________in the ocean, is required.【C8】________we will need to【C9】________cobalt recycling by recovering it from batteries in【C10】________electric cars, laptops and mobile phones.
    Another【C11】________is to shift to【C12】________that use less cobalt, or none at all. Elon Musk’s car firm Tesla is in【C13】________with battery manufacturer CATL to use entirely cobalt-free batteries in its China-made cars,【C14】________a report last week by Reuters.
    Lithium-ion batteries in electric cars commonly use【C15】________lithium nickel cobalt aluminium oxide【C16】________lithium nickel manganese cobalt oxide for their ability to【C17】________a long lifespan and【C18】________energy density—a key factor in how【C19】________an electric car can go【C20】________a single charge.
【C10】
选项 A、reluctant
B、recalcitrant
C、abundant
D、redundant
答案D
解析 形容词辨析题。四个选项分别为[A]reluctant“不情愿的”；[B]recalcitrant“反抗的”；[C]abundant“丰富的”；[D]redundant“多余的”。空格所在句意为“从电动汽车、笔记本电脑和移动电话的电池中回收钴来加强钴的回收利用”，空格处所填词应有“多余的”之意，结合四个选项，只有[D]选项符合题意，故答案为[D]选项。
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