2. 医学
  3. In the next 40 years, the percentage of people in the United States over the age of 65 is expected to double.【C1】______the needs

In the next 40 years, the percentage of people in the United States over the age of 65 is expected to double.【C1】______the needs

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问题     In the next 40 years, the percentage of people in the United States over the age of 65 is expected to double.【C1】______the needs of this part of the populations is a【C2】______to the ingenuity of America. To a【C3】______degree, a society is judged by【C4】______it cares for those who can no longer care for themselves.
    High technology【C5】______the most startling advances in helping the elderly. In addition to the well-known artificial heart implantation, there are efforts underway to【C6】______artificial lungs, livers, and bones. An electric ear is【C7】______seventy-five percent effective. The implants will【C8】______better medical care by releasing minute doses of drugs into the body continuously.
    For the older people, even the simplest tasks can be difficult, sometimes impossible to perform. American business have responded【C9】______their needs with a variety of inexpensive but useful products. Companies have designed extra-efficient can openers that enable people【C10】______bands have become too weak to open cans easily. There are devices that allow people to put on a pair of socks without straining their backs. Combs with long handles and U-shaped back brushes are available for those who can not reach as far as they could when they were young.
【C4】
选项 A、how
B、why
C、who
D、whom
答案A
解析 表示方式状语，用how。
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