函数f（x）=2x3的图象[ ]
A.关于y轴对称
B.关于x轴对称
C.关于直线y=x对称
D.关于原点对称
答案：D
It is reported that many a new house ______ at present in the disaster area.
A．are being built
B．were being built
C．was being built
D．is being built
苏轼的教战守策属于奏议中的什么？
