单项选择题

People generally believe that on-line trading is a practice of ______.

A．senior investors
B．people in a specific province
C．relatively young people
D．groups made up of 20 or 30 traders

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假设你是刘梅，请你就本市某些开发商无计划拆除旧建筑，改造城区的现象给市长写一封信，内容应涉及进行城区改造的必要性、没有计划地拆除旧建筑的危害，以及你本人的观点和建议。

单项选择题

Compared with other age groups, why should older investors be more cautious about their in vestment

A．They often turn a deaf ear to others' advice.
B．They tend to be more gambling in nature.
C．They are not so quick-witted as the young.
D．They do not have as many sources of income.

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