单项选择题

What kind of disease is not caused by the use of mobile phone

A．Fatigue.
B．Headache.
C．Alzheimer's disease.
D．Tuberculosis.
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单项选择题
What is the meaning of Skating on thin ice
A．One may be doing something quite difficult.
B．One may be doing something quite risky.
C．One may be doing something quite annoying.
D．One may be doing something impossible.
填空题
Why do some people send cards to themselves on February 14
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