Most animals we commonly observe do in fact age as we do, if given the chance to live long enough; and mechanical systems like a wound watch, or the sun, do in fact an out of energy in accordance with the second law of thermodynamics . But these are not analogous to what happens when man ages. A run-down watch is still a watch and can be rewound. An old watch, by contrast, becomes so worn and unreliable that it eventually is not worth mending. But a watch could never repair itself--it does not consist of living parts, only of metal, which wears away by friction. We could,at one time, repair ourselves--well enough, at least, to overcome all but the most instantly fatal illnesses and accidents. Between twelve and eighty years we gradually lose this power; an illness which at twelve would knock us over, at eighty can knock us out, and into our grave. If we could stay as vigorous as we are at twelve, it would take about 700 years for half of us to die, and another 700 for the survivors to be reduced by half again.

　　1. Which of the following statements is INCORRECT?

　　A. Our first twelve years represent the peak of human development.

　　B. People usually are unhappy when reminded of ageing.

　　C. Normally only a few of us can live to the eighties and nineties.

　　D. People are usually less likely to die at twelve years old.

　　2. The word it in the last sentence of Paragraph Two refers to

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