单项选择题

The author's purpose of writing this passage is to ______.

A．alert readers to the scarcity of natural resources
B．call for more research on the influence of geographical environment
C．introduce different elements in character cultivation
D．draw more attention to the health condition of mankind
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单项选择题
Which of the following generalizations of people's type is true
A．People who like drinking wine tend to be optimistic.
B．People who live in mountain areas tend to have a long life.
C．People who live in areas with stable climate tend to be talkative and lively.
D．People who like drinking cow blood tend to be strong and tall.
单项选择题
According to the passage, research into the influence of climate and geography should ______.
A．focus on unknown aspects
B．be pursued on a larger scale
C．be carried out among remote tribes
D．go ahead in depth
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