题目

种植用材林时，为使主干长的笔直高大，侧枝长得少，栽培应注意的是（    ）     A、保护侧枝和侧芽              B、摘除主干的顶芽  C、保护主干的顶芽               D、保护侧枝的顶芽 答案：C     she,    child,    pollute,   achieve,    seventy1. My grandma likes to be with the young though she is in her now.