15.DA.添加奀2中的种子不带胚B.Z2和z4无透明圈C.斐林试剂的使用需要水浴加热后才出现砖红色D.用③的匀浆代替GA处理①,结果出现透明圈

Dear JackIm glad to know that you are paying more attention toyour health and' planning to take part in a fitness project. Ithink it is wise of you to do so because nothing ismoreimportant than health in the world. Without health, we canhardly live a happy lifeAs to the way to keep"fit, I suggest you shouldplaying table tennis. It can not only get your musclesinvolved when you play but also benefit your eyesightWhat's more, it can improve your balance and keep yourbrain sharp. So I'm sure you can be much stronger bypracticing itLooking forward to receiving your good newsYours sincerelyLi Hu

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