单项选择题

According to the passage, research into the influence of geography and climate 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
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
单项选择题
What is the topic of this passage
A．The importance of environment protection.
B．The influence of geographical environment.
C．Different elements in character cultivation.
D．The psychological and physical health of humankind.
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