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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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.
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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