下列哪个问题科学能够解释？（）
A.什么是美
B.什么是水
C.什么是善
D.什么是恶
参考答案：B
若点M（x，y）的坐标满足关系式xy=0 ，则点M在[ ]
A.原点
B.x轴上
C.y轴上
D.x轴上或y轴上
____ Lucy ___ Lily may go to the concert with you. Because they are not allowed to go out on school nights. [ ]
A. Either; or
B. Neither; nor
C. Both; and
D. Not only; but also
