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  3. Advancing age means losing your hair, your waistline and your memory, right? Dana Denis is just 40 years old, but【1】she’s worrie

Advancing age means losing your hair, your waistline and your memory, right? Dana Denis is just 40 years old, but【1】she’s worrie

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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【1】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【2】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【3】you remember? Well, sort of. But as time goes by, we tend to blame age【4】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【5】." In fact, the 70-year-old may have been【6】things for decades.
    In healthy people, memory doesn’t worsen as【7】as many of us think. "As we【8】, the memory mechanism isn’t【9】." says psychologist Fergus Craik. "It’s just inefficient."
    The brain’s processing【10】slows down over the years, though no one knows exactly【11】. Recent research suggests that nerve cells lose efficiency and【12】there’s less activity in the brain. But, cautions Barry Gordon, "It’s not clear that less activity is【13】. A beginning athlete is winded (气喘吁吁)more easily than a【14】athlete. In the same way,【15】the brain gets more skilled at a task, it expends less energy on it."
    There are【16】you can take to compensate for normal slippage in your memory gears, though it【17】effort. Margaret Swell says: "We’re a quick-fix culture, but you have to【18】to keep your brain 【19】shape. It’s like having a good body. You can’t go to the gym once a year【20】expect to stay in top form."
【15】
选项 A、as
B、till
C、though
D、yet
答案A
解析 从句引导词题。空格中所需的引导词是引导状语从句的，从句的大意为：大脑在处理任务方面日益熟练，主句大意为：大脑消耗的能量更少。由此我们可以推断空格中引导的状语从句是主句的条件状语从句，或者时间状语从句，或者原因状语从句。A项as可以引导时间状语从句表“随着……”之意，也可以引导原因状语从句表“因为……”，这两种理解都符合题意，为本题答案。B项till意为“直到”，不符合题意；C项though意为“虽然……，但是……”，不符合题意；D项yet是篇章副词，不能引导从句，不符合题意。
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