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
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
How does the author evaluate the generalizations of people's types in Para. 3
A．Such generalizations help us judge the different characters of people we meet.
B．Such generalizations are not inclusive enough to draw a convincing conclusion.
C．Such generalizations prove that nature plays an important role in determining social habits.
D．Such generalizations show that there are mainly two different types of people on the planet.
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