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
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
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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