【单选题】已知函数 , ,已知当 时,函数 所有零点和为9,则当 时,函数 所有零点和为( )
【单选题】— Tree Planting Day is coming. Do you plant trees in spring? — Yes, many trees _____ in our city every year. [ ]
【单选题】--Tree Planting Day is coming. Do you plant trees in spring? ---Yes, many trees ________ in our city every year.