【简答题】A.If they don't involve any risks. B.If they produce predictable side effects. C.When the urgent need for them arises. D.When tests show that they are relatively safe.
【简答题】A.If they are not satisfied with the educational system. B.If they have an approved systematic educational plan. C.If they are willing to take teachers as their jobs. D.If their children are unable to...
【简答题】A.If they can make children learn. B.If they can ask children to sit for hours. C.If they can persuade children to learn. D.If they lead children to learn more.