the boy often help the old people clean their houses对help the old people clean their houses提问

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• 英语翻译Each nation has many good people who help to take care of others.For example,some high school and college students in the United States often spend many hours as volunteers in hospitals,orphanages or homes for the aged.They read books to the people in these places,or they just visit them and play games with them or listen to their problems.Other young volunteers go and work in the homes of people who are sick or old.They paint,clean up,or repair t
• the boy often help the old people clean their houses对help the old people clean their houses提问
• My mother dusts the furniture （once a week.)(对括号内提问）The Young Pineers the often (help the old clean their houses.)(对括号内提问)Mike took some pictures in the park yesterday.(用every day 替换 yesterday)My teacher corrects our homework after school(否定句)
• the boy often help the old people clean their houses对help the old people clean their houses提问
• 一根铁丝长十分之九米,第一次用去它的八分之三,第二次用去它的五分之二,还剩全长的几分之几?
• 已知向量a=(cos2x,sin2x),b=(cosx,sinx)(x∈r),设f(x)=3|a+b|+m|a-b|已知向量a=(cos2x,sin2x),b=(cosx,sinx)(x∈r),设f(x)=3|a+b|+m|a-b|（m为正常数）当m≠3时,函数f（x）的最小值能否等于1,若能求出m的值,若不能,请说明理由