单项选择题

According to the passage, which of the following factors most influences where life is found on earth

A．Climatic conditions.
B．The length of days and nights.
C．Ocean tides.
D．Geographic boundaries.
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单项选择题
According to the passage, human beings can survive almost everywhere on Earth because ______ .
A．they have developed advanced forms of transportation.
B．they have learned how to process seawater for drinking.
C．their body temperature can vary considerably.
D．their shelter and clothing help them adapt to the environment.
单项选择题
According to the passage, which of the following can be found in the greatest number of different climate area on earth
A．Penguins.
B．Camel
C．Bears.
D．Mosses.
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