Parents shouldn't always satisly children's c_____ without limit,

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• Parents shouldn't always satisly children's c_____ without limit,
• 英语翻译Linda Miller,a mother of three in London,knows all about such pressure."In some families,competition stars from a very young age,"she says."Mothers send their kids to all kinds of classes when they are very young.And they are always comparing them with other children.It's crazy.People shouldn't push their kids so hard." Dr Alice Green agrees.She also says that these children may find it hard to think for themselves when they are older."Parents are
• 甲乙两个溜冰者质量分别为48kg和50kg,乙手里拿着质量为2kg的球,两人均以2m/s的速率,在光滑的冰面上沿同一直线相向滑行,甲将球传给乙,乙再将球传给甲,这样抛接几次后球在甲手里,乙的速度为0,则甲的速度大小为 16m/s
• 甲、乙两滑冰者质量分别为50kg和52kg,两人均以3m/s的冰面上相向滑行.