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

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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."
【C11】

选项 A、why
B、how
C、what
D、when

答案A

解析 上下文语义。本句的意思是“经过多年之后,大脑处理事情的时间慢了下来,虽然没有人知道其中的确切原因”。A项为正确答案,其他选项都不合题意。
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