单项选择题

A．They are overconfident.
B．Their brains grow too fast.
C．They are psychologically dependent.
D．Their brains are still immature in some areas .
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单项选择题
Just because it has not been confirmed yet whether mobile phone emissions can harm human tissue, according to the government report, it does not mean that ______.
A．the government should prohibit children from using cell phones
B．we should put down the phone for the sake of safety
C．the industry can have a right to promote phone use
D．children are safe using cell phones
单项选择题
A．They usually say no. B．They usually say yes.C．They usually wait and see.D．They usually refuse to say anything.
A．They usually say no.
B．They usually say yes.
C．They usually wait and see.
D．They usually refuse to say anything.
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