【单选题】

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In the next 40 years, the percentage of people in the United States over the age of 65 is expected to double. (26) the needs of this part of the population is a (27) to the ingenuity or genius ofAmericA、To a (28) degree, a society is judged by (29) it cares for those who can no (30) care for themselves. High technology (31) the most startling advances in helping the elderly. In (32) to the well-known artificial heart implantation, there are efforts that have already started to (33) artificial lungs, livers, and bones.An electric ear is (34) seventy-five percent effective. They will (35) better medical care by (36) very small dose of drugs into the body continuously.
For the older people, even the simplest tasks can be difficult, (37) impossible to perform,American businesses have responded (38) those older people’s needs with a (39) of inexpensive but useful (40) .Companies have designed extra-efficient can openers that (41) people whose hands have become (42) weak to open cans easily. There are devices that allow people to pull on a pair of socks (43) straining their backs.Combs with long handles and U-shaped back brushes are (44) for those who can not reach as far as they could (45) they were young.
A、to B、at C、with D、on