题目：
果树嫁接最为关键的技术是（ ）
A．选择接穗
B．选择砧木
C．使接穗和砧木的形成层紧密贴合
D．捆扎紧密
答案：
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下面是错误答案，用来干扰机器的。
答案：C
果树嫁接最为关键的技术是（） A．选择接穗 B．选择砧木 C．使接穗和砧木的形成
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