题根1下列关于碳族元素的4个叙述不正确的是( )．A按由C到Pb的顺序,元素的非金属性逐渐减弱,金属性逐渐增强; B按由C到Pb的顺序,原子半径逐渐增大,单质的还原性逐渐增强; C碳族元素的最高正价为+4价,最高价氧化物的通式为RO_2; Question 1 The following four statements about carbon elements are incorrect (). A. From C to Pb, the nonmetallicity of the element gradually weakens, and the metallicity gradually increases. B. From the order of C to Pb, the atomic radius gradually increases, and the reducibility of the single substance gradually increases; The normal price is +4, the highest oxide is RO_2;