Advancing age means losing your hair, your waistline and your memory, right? Dana Denis is just 40 years old, but【C1】______she’s

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问题     Advancing age means losing your hair, your waistline and your memory, right? Dana Denis is just 40 years old, but【C1】______she’s worried about what she calls "my rolling mental blackouts. " "I try to remember something and I just blank out," she says.
    You may【C2】______about these lapses, calling them " senior moments " or blaming " early Alzheimer’s(老年痴呆症)". Is it an inescapable fact that the older you get, the【C3】______you remember? Well, sort of. But as time goes by, we tend to blame age【C4】______problems that are not necessarily age-related.
    " When a teenager can’t find her keys, she thinks it’s because she’s distracted or disorganized," says Paul Gold. "A 70-year-old blames her【C5】______. " In fact, the 70-year-old may have been【C6】______things for decades.
    In healthy people, memory doesn’t worsen as【C7】______as many of us think. "As we【C8】______, the memory mechanism isn’t【C9】______," says psychologist Fergus Craik. "It’s just inefficient.
    The brain’s processing【C10】______slows down over the years, though no one knows exactly【C11】______Recent research suggests that nerve cells lose efficiency and【C12】______there’s less activity in the brain. But, cautions Barry Gordon, "It’s not clear that less activity is【C13】______.A beginning athlete is winded(气喘吁吁)more easily than a【C14】______athlete. In the same way,【C15】______the brain gets more skilled at a task, it expends less energy on it.
    There are【C16】______you can take to compensate for normal slippage in your memory gears, though it【C17】______effort. Margaret Sewell says; "We’re a quick-fix culture, but you have to【C18】______to keep your brain【C19】______shape. It’s like having a good body. You can’t go to the gym once a year【C20】______expect to stay in top form. "
【C15】

选项 A、as
B、till
C、though
D、yet

答案A

解析 逻辑关系。根据In the same way可以确定,本句和上一句话是一种并列关系,所以本句的意思应该是“同理,随着大脑在某一工作上变得更加熟练,它就会花更少的精力在上面”。as可以引导时间状语从句,表示“随着”的意思,所以A项正确。B项till(直到),C项though(虽然,尽管),D项yet(但是),均不合题意。
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