Javascript采用事件驱动，用鼠标单击按钮时产生的事件是()。
A
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Ataskofthepostofficestaffisto_(class)mailaccordingtotheplacesitistogo
Forthoseinvolved,thescandalhasbeenavery________(pain)experience
货币充当商品交换媒介所执行的职能是（）
Justafewyearsago，Tanyawas___(home)andbeggingformoneyinfrontofasupermarketinNewYorkCity.
Theplantsneedsandwitha___(deep)ofatleast10to15cmtogrow.