The word "display" in line 17 is closest in meaning to（）
A. communicate
B. imitate
C. initiate
D. exhibit
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In western North America （） form the Great Divide, which separates the areas from which waters flow either eastward to the Atlantic or westward to the Pacific.
A. the Rocky Mountains
B. where the Rocky Mountains
C. the Rocky Mountains in which
D. there are the Rocky Mountains
According to paragraph 3, which of the following is most important for an effective survey（）
A high number of respondents
B. Carefully worded questions
C. An interviewer's ability to measure respondents' feelings
D. A sociologist who is able to interpret the results
(Heat) exhaustion is (causing) by excessive (loss) of body (fluids) and body salts.（）
A. Heat
B. causing
C. loss
D. fluids
According to the passage, the Mississippi River was（）
A. one of the boundaries of a region where new agricultural settlement took place
B. a major source of water for agricultural crops
C. the primary route by which agricultural crops were transported
D. a main source of power for most agricultural machinery
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