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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.
【C18】
选项 A、small
B、low
C、big
D、high
答案D
解析 形容词辨析题。四个选项分别为[A]small“小的”；[B]low“低的”；[C]big“大的”；[D]high“高的”。根据原文“________能量密度”，密度一般用高低来形容，并结合语境可知，空格处所填词应有“高的”之意，只有[D]选项符合题意，故答案为[D]选项。
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