单项选择题

What's the result of the French study

A．The harm of mobile phone radiation is life-threatening.
B．Mobile phone may affect one's normal way of thinking.
C．Sleep disorders could result from mobile phone radiation.
D．A protein called hsp27 is killed by mobile phone radiation.
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According to the passage, the use of mobile phone is unlikely to cause ______.
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B．headache
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According to the passage, the cost increase in the rail industry is mainly caused by ______.
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