题目

You probably know that exercise is the key to reducing depression, but you might not know why. Here are some tips for exercising when you’re depressed.Change your view of “exercise”.Forget “exercise”. Instead, think “being active” or “having fun”. 【1】 Besides, it gives you a bigger benefit.【2】Taking part in physical activities with others supports you in doing those activities. Ask friends what activities they’re doing or they would like to start doing, and join them. Other choices include hiring a personal trainer, joining an exercise group or going to a class.Try a、b、c、d是四种短周期的主族元素.a、b、d同周期,其中d的质子数最大;a、c同主族.a的原子结构示意图为:;a与b形成化合物的电子式为:.下列叙述正确的是(  )A.原子半径:a>c>dB.非金属性:c>a>dC.相应氢化物的沸点:d>c>aD.c与a、c与b均能形成两种常见化合物
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