問題詳情：
America is growing older. Fifty years ago, only 4 out of every 100 people in the United States were 65 or older. Today, 10 out of every 100 Americans are 61 65. The aging of the population will affect American society in many ways—education, medicine, 62 (busy). Quietly, the graying of America has made us a very different society—one in which people have a quite different idea of what kind of behavior is 63 (suit) at various ages. A person’s age no longer tells you anything about his/her position, 64 (marry) or health. There’s no longer a particular year 65 one goes to school or goes to work or gets married or starts a
family. The social clock that 66 (keep) us on time and told us when to go to school, get a job, or stop working isn’t as strong as used 67 (be). It doesn’t surprise us to hear of a 25-year-old university president or a 35-year-old grandmother, or 68 80-year-old man who has become a father for the first time. Public ideas are changing. Many people say, “I am much 69 (young) than my mother—or my father—was at my age.” No one says “Act your age” any more. We’ve stopped 70 (look) with surprise at older people who act in youthful ways.
【回答】
考查介詞，根據前文fifty years ago的情況判斷現在10分之一的美國人超過65歲，over 超過。
ness 考查名詞。根據前文的deucation，medicine判斷此處用busy的名詞形式business商業。
able 考查形容詞。此處缺少表語，應用suit的形容詞形式。
64. marriage 考查名詞。根據空前後的position和health判斷填marry的名詞形式marriage。
考查定語從句。空後的定語從句中缺少時間狀語，故填when。
考查時態。題幹中後文有told，並列的謂語動詞也應用過去式。
be 考查不定式。used to be過去常常是。
考查冠詞。80eighty是以母音音素開頭的單詞，故用冠詞an。
ger 考查比較級。根據空後的than判斷填younger。
70. looking 考查動名詞。stop doing sth停止正在做的事情。
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