单项选择题
A.Red. B.Blue. C.Green. D.Purple.
A.Their lack of concentration resulting from mental stress. B.The lack of consideration for them in equipment design. C.The probability of their getting excited easily. D.Their slowness in responding.
A.It provides them with the opportunity to watch performances for free. B.It provides them with the opportunity to make friends. C.It gives them the chance to do something creative. D.It gives them a chance to enjoy modern art.