题干

以前,人们往往认为一切生物的生长都依赖阳光。现在科学家发现,在水深超过6000米的可见光不能到达的海底,在高温、高压、剧毒、缺氧的环境里,仍然存在大量海底热液生物,它们靠海底热液带出的能量进行化合作用合成有机质而生存。这从一个侧面表明(    )

①对真理的追求是永无止境的循环过程

②真理是理论与实践的具体的历史的统一

③客观事物的复杂性决定了认识的反复性

④认识只有不断超越历史条件才能成为真理

A:①②

B:①④

C:②③

D:③④

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C

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    Getting older is a natural part of life. Changes as you get older are usually gradual. Certain physical changes are common. How fast your body can burn calories slows over time, which means that your body needs less food energy than before.

    How much and how well you sleep will likely change. Most people start needing reading glasses around forty, and many have some hearing loss later in life. Starting in your fifties, bone aging increase. How you feel as you get older depends on many things, including what health problems run in your family and the choices you make.

    If your family members have diseases or chronic (慢性的) health problems like high blood pressure, then you may have a greater chance of having those problems yourself. But it doesn't mean you will definitely have the same problems. Actually, the lifestyle choices you make can help reduce your chances of getting illness that run in your family. And even if you do get a family illness, choosing to be physically active, to eat healthy foods, and to learn how to deal with stress can keep the illness from destroying your ability to enjoy your golden years.

    What do you need to do to feel your best as you age? One of the most important things you can do for your health at any age is to be physically active. Physical activity keeps your body strong, and it helps with how you feel. People who stay active are less likely to get depressed.

    Your mental and emotional health is also important. Protect or improve your emotional health by staying in touch with friends, family, and the community. People who feel connected to others are more likely to feel happy than those who do not.