螺丝刀的刀柄上刻有花纹是为了增大____ ；切菜刀的刀刃要磨得锋利是为了增大____ 。

儒家的灾异理论认为自然界的灾异与皇帝的作为有很大的联系。魏晋以来，皇帝通常以罪己的方式应对灾异事件；而到了清朝，皇帝则经常利用灾异督责大臣，痛斥官员的恶行。这种变化表明清朝（    ）

    Today is Tree- Planting Day. I go to the park with my parents. At about ten o'clock we start to plant trees. We needn't to dig holes because the people in the park dug them before. We just put the young trees into the holes. My father fills the holes with me. My mother carries water for the young trees. We are so tired when we finish the work. All of us hope the trees will grow well. I hope I can plant trees next year.

①C市规定购买首套普通住房的首付款最低比例提高至30%

②G省财政厅公开招标发行2017年G省第五批政府债券

③国务院决定对有潜在价值、暂时经营困难企业实施债转股试点

④某上市公司发布公告，向相关银行申请延期一年偿还贷款本息