题目

棉花在生长到一定高度后,棉农往往进行“打顶”,主要目的是( ) A . 限制棉花长高 B . 为了植株美观 C . 抑制侧芽的发育,多开花结果 D . 促进多生侧枝,多开花结果 答案:DDo tell me the ways you think of __________ the problem as soon as possible. A. to solve                             B. solving C. solve                               D. being solved  
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