更多"With age, the mineral content of hu"的相关试题:
[单项选择]________.. including climate, mineral content, and the permanency of surface water, wetlands may be mossy ,grassy, scrubby, or wooded.
A. Depending on many factors
B. Many factors depending on
C. Factors depending on many
D. On many factors depending
[填空题]The walls framing the highways are useful in decreasing noise pollution, because ______.
[简答题]
At the age of twelve years, the human body is at its most
vigorous. It has yet to reach its full size and strength, and its owner his or
her full intelligence; but at this age the likelihood of death is least. 71.
Earlier, we were infants and young children, and consequently more
vulnerable; later, we shall undergo a progressive loss of our vigor and
resistance which, though imperceptible at first, will finally become so steep
that we can live no longer, however well we look after ourselves, and however
well society, and our doctors, look after us. This decline in vigor with the
passing of time is called aging. It is one the most unpleasant discoveries which
we make that we must decline in this way, that if we escape wars, accidents and
diseases we shall eventually "die of old age", and that this happens at a rate
which differs little from person to person, so that there are heavy odds in
favor of our dying between the ages of sixty-five and e
[单项选择]It is human nature to think back to Golden Age______ one’’ s country was strong and respected.
A. when
B. provided
C. as
D. unless
[单项选择]
Prolonging Human Life
Prolonging human life has increased the size of the human population. Many people alive today would have died of childhood diseases if they had been born 100 years ago. Because more people live longer, there are more people around at any given time. In fact, it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion.
Prolonging human life has also increased the dependency load. In all societies, people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures, old people who could not keep up might be left behind to die. In times of famine, infants might be allowed to die because they could not survive if their parents starved, whereas if the parents survived they could have another child. In most contemporary societies, people feel a moral obligation to keep people alive whether they can work or not. We have
A. an increase in birthrates.
B. the industrial development.
C. a decrease in death rates.
D. cultural advances.