行道树类幼年期以快生长、高树干、促进旺长为目的，成形后保证骨干枝的增高生长，（）可促进生长。
A、轻剪
B、重剪
C、摘心
D、疏叶
参考答案：B
Mary: What do you think of my new dress?
Sue: ________.
A．It is on sale
B．You really have a new dress
C．It looks very good on you
D．I think it’s a birthday present for you
下列哪种形式的脚手架不得作为承重脚手架（）。
A、杉槁
B、扣件式钢管
C、碗扣式钢管
