单项选择题

The author mentioned the studies in this passage to suggest that _________.

A．we should make better generalizations about types of people in the world
B．we should find better water supplies in some dry areas
C．we should gain insight into the influence of geographical environment on man
D．we should cultivate a favorable psychology and health in our own environment
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单项选择题
With the examples of less talkative inhabitants in countries with long dark winters and of cheerful, talkative and casual inhabitants where olives and oranges grow, the author wants to reveal that _________.
A．climate preferences differ among people of different characters
B．olives and oranges are decisive of forming outgoing personality
C．geography and climate play an important role in determining the inhabitants' social habits
D．there are mainly two different types of people on the planet
单项选择题
It can be inferred that iodine, fluoride, calcium... (Line 3, Para. 2) means _________.
A．substances which influence human health
B．harmful substances in the water supply
C．substances which help provide breeding places for pests
D．substances contributory to the height and strength of a person
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