单项选择题

It can be inferred that proper amounts of iodine, fluoride and calcium can ______.

A．benefit people's physical health
B．influence the quality of water supply
C．help provide breeding places for pests
D．strengthen a person's character
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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
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.
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