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【单选题】
li.li1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'PingFang SC'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font: 14.0px 'Times New Roman'; -webkit-text-stroke: 0px #000000}span.s2 {font-kerning: none}span.Apple-tab-span {white-space:pre}ol.ol1 {list-style-type: decimal} 下列元素符号代表镧系元素铈的是
A.
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} Sm
B.
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} Ce
C.
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} Sr
D.
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} Se
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参考解析：
刷刷题刷刷变学霸
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