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问题 解答题

等腰三角形、圆形、长方形都是轴对称图形．______．

答案

因为把这几个图形分别沿一条直线对折后，直线两旁的部分能够互相重合，所以说它们都是轴对称图形．

答：等腰三角形、圆形、长方形都是轴对称图形，是正确的．

故答案为：正确．

多项选择题

在哈罗德模型中，如实际增长率大于有保证的增长率，其可能的后果是（）

A.由于实际资本存量大于企业家需要的数量，经济最终将趋于停滞

B.由于实际资本存量小于企业家需要的数量，经济最终将趋于停滞

C.由于实际资本存量大于企业家需要的数量，经济最终将趋于高涨

D.由于实际资本存旦小于企业家需要的数量，经济最终将趋于高涨

E.由于实际储蓄率高于合意的储蓄率，经济最终将趋于高涨
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单项选择题

Another critical factor that plays a part in susceptibility to colds is age. A study done by the University of Michigan School of Public Health revealed particulars that seem to hold true for the general population. Infants are the most cold-ridden group, averaging more than six colds in their first year. Boys have more colds than girls up to age three. After the age of three, girls are more susceptible than boys, and teenage girls average three colds a year to boys’ two.
The general incidence of colds continues to decline into maturity. Elderly people who are in good health have as few as one or two colds annually. One exception is found among people in their twenties, especially women, who show a rise in cold infections, because people in this age group are most likely to have young children. Adults who delay having children until their thirties and forties experience the same sudden increase in cold infections.
The study also found that economics plays an important role. As income increases, the frequency at which colds are reported in the family decreases. Families with the lowest income suffer about a third more colds than families at the upper end. Lower income generally forces people to live in more cramped quarters than those typically occupied by wealthier people, and crowding increases the opportunities for the cold virus to travel from person to person. Low income may also adversely influence diet. The degree to which poor nutrition affects susceptibility to colds is not yet clearly established, but an inadequate diet is suspected of lowering resistance generally.

Which of the following statements is NOT true according to the passage

A．The women having children show a rise in cold infections than those without children.
B．People with low income will surely more colds than people with high income.
C．Juniors are easier to have colds than seniors.
D．It has not been proved scientifically that poor nutrition affects susceptibility to colds.
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