题目

某种遗传病受一对等位基因控制，下图为该遗传病的系谱图。下列叙述正确的是 A．该病为伴X染色体隐性遗传病，Ⅱ1为纯合子 B．该病为伴X染色体显性遗传病，Ⅱ4为纯合子 C．该病为常染色体隐性遗传病，Ⅲ2为杂合子   D．该病为常染色体显性遗传病，Ⅱ3为纯合子 答案：C 解析: 略The digital camera is so great. I’ve never seen a better one before, but the price of it is ______ in the store.              A．higherB．the most expensiveC．the highestD．more expensive