Which set is a proper subset of E ( ) E= {0,1,2,3}

A．{ x|x is a real number and x—3=0}

B．{ x|x is a real number and x²—9}

C．{ x|x is a real number and x²+5x+6=0}

D．{0,1,2,3)

古诗句“欢娱嫌夜短，寂寞恨更长”描写的心理现象是

A．空间错觉

B．时间错觉

C．运动错觉

D．视觉错觉