下列属于常量元素的是 （）
A.铁
B.碘
C.锌
D.铜
E.氯
参考答案：E
Seen from (the) outer space, the earth is ________ a blue ball
A．anything but
B．nothing more than
C．not more than
D．none other than
A．钟
B．表
C．停表
D．闹钟
