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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.
【C4】
选项 A、whether
B、while
C、though
D、if
答案D
解析 逻辑关系题。四个选项分别为[A]whether。“是否”；[B]whiIe“尽管”；[C]though“虽然”；[D]if“如果”。根据原文“________我们不开始更高效或大量地提炼和回收钴，钴可能会短缺”，空格处所填词应有“如果”之意，四个选项中只有[D]选项符合题意，故答案为[D]选项。
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