单选题Why is a special substance painted on the tree? _____ATo make a wound smooth.BTo prevent disease entering a wound.CTo cover a rough surface.DTo help a wound to dry.
单选题
Why is a special substance painted on the tree? _____
A
To make a wound smooth.
B
To prevent disease entering a wound.
C
To cover a rough surface.
D
To help a wound to dry.
参考解析
解析：
通读第三段可以推出，修剪树木留下的伤口给了疾病侵袭的机会，因此涂刷特殊物质是为了阻挡疾病通过伤口进入树木。
通读第三段可以推出，修剪树木留下的伤口给了疾病侵袭的机会，因此涂刷特殊物质是为了阻挡疾病通过伤口进入树木。
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