单项选择题

The passage mentions all of the following factors for the existence of life EXCEPT().

A. the right amount of atmosphere.
B. a steady supply of water.
C. steady heat and light.
D. the right distance from the sun.

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单项选择题
Industry is primarily concerned with applied researches because it can bring immediate profits.()

A. Right
B. Wrong
C. Not mentioned
单项选择题
X-rays used in medical researches belong to the scope of basic research.()

A. Right
B. Wrong
C. Not mentioned
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