While income worry is _______ rather common problem of the aged, loneliness is another problem that _______ aged parents may face.
A．a(chǎn); theB．the; /C．a(chǎn); /D．the; the
C

試題分析：句意：對(duì)于收入的擔(dān)心是老年人的一個(gè)相當(dāng)普遍的問(wèn)題，孤獨(dú)是老年父母可能面對(duì)的另一個(gè)問(wèn)題。第一個(gè)空，是泛指“一個(gè)相當(dāng)普遍的問(wèn)題”，故用不定冠詞a；第二個(gè)空，表示一類(lèi)人的可數(shù)名詞復(fù)數(shù)形式前，不用冠詞，選C。
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Passage outline
Supporting details
A 小題1:     in the history of medicine
◆ 55-year-old Lewis was on the
小題2:      of death. He was told that he only had 12 hours to live.
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小題3:     and replaced it with an artificial one.
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Reasons for being小題8:  about this artificial heart.
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小題9:     the device before it is massively produced.
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