题目

The question that is embarrassing is hard to answer. → is hard to answer. 答案：【1】The embarrassing question 下图为某DNA分子片段，下列与此图有关的酶的功能的叙述，不正确的是 [　　] A． 切断a处的酶可为限制性内切酶 B． 连接a处的酶可为DNA连接酶 C． 切断b处的酶可为解旋酶 D．连接b处的酶可为DNA聚合酶