题目

Mo Yan's novel Frogs ________ into many languages since it came out in 2009. A . was translated B . has translated C . has been translated D . translated 答案：C甜菜块根细胞中有花青素，使块根呈红色。将块根切成小块放在蒸馏水中，水无明显的颜色变化。但用盐酸处理这些块根后，则能使水变红，这是因为 A．细胞壁被盐酸破坏 B．花青素不溶于水而溶于盐酸 C．盐酸破坏了细胞膜的选择透过性 D．盐酸破坏了原生质层的选择透过性