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食叶害虫的种群数量常常呈现周期性变化,例如,落叶松毛虫在我国东北一般( )年大发生1次。
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食叶害虫的种群数量常常呈现周期性变化,例如,落叶松毛虫在我国东北一般( )年大发生1次。
A、7
B、14
C、8-13
D、35
时间：2021-09-02 13:35
关键词：
青书学堂
东北林业大学
森林昆虫学
答案解析
C
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食叶害虫的种群数量常常呈现周期性变化,例如,落叶松毛虫在我国东北一般( )年大发生1次。
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