单项选择题

Which of the following statement is CORRECT

A．Drastic changes in the weather have been common since ancient times.
B．The change in weather from very cold to very hot lasted over a century.
C．The scientists have been studying ice to forecast weather in the future.
D．The past 10,000 years have seen minor changes in the weather.
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问答题
一个人的声明究竟有多大意义，这有什么标准可以衡量吗？提出一个绝对的标准当然很困难；但是，大体上看一个人对待生命的态度是否严肃认真，看他对待工作、生活的态度如何，也就不难对这个人的存在意义做出适当的估计了。 古来一切有成就的人，都很严肃地对待自己的生命，当他活着一天，总要尽量多工作、多学习，不肯虚度年华，不让时间白白浪费掉。我国历代劳动人民以及大政治家、大思想家等等都莫不如此。
单项选择题
Which of the following is NOT Professor McKay’’s view
A．People change in old age a lot more than at the age of 21.
B．There are as many sick people in old age as in middle age.
C．We should not expect more physical illness among old people.
D．We should not expect to find old people unattractive as a group.
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