单项选择题

In the last sentence of the second paragraph, "the higher places on earth" refers to ()

A. the high mountains
B. the lighter rocks
C. the vast ocean
D. the great continent

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单项选择题

The concept discussed in the passage is actually the ()

A. traditional beliefs among people living in different areas
B. results of certain study on people living in different climate zones
C. belief that has no longer accepted by most of people
D. study clone by Ellsworth Huntington alone

单项选择题

() Americans owned a bathtub as early as 1895.

A. Many
B. Not all
C. All
D. Few