用右图实验装置研究甲状腺激素对小白鼠的新陈代谢是否有促进作用，装置可以满足实验所需的条件。实验步骤如下：①将数只生理状况相同、健康的小白鼠平均分为甲、乙两组， 分别放人两个装置中饲养。②甲组喂食普通饲料，乙组喂食等量的添加甲状腺激素的同种饲料，一段时间后测量并记录两装置中红色液柱的移动距离。

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    Long ago,there was a mother and a son living in a house.She worked hard every day,____they were always poor.

    One day,her son stole his friend's bag.“Mom,what do you think of this bag?”His mother praised her son instead of scolding him.The next time,he stole____overcoat.She praised him again.A few years____(late),he grew up to be a young man.He stole jewelry and brought them to his mother.This time,she did not scold her son.Then,he started____ (steal) more expensive things.

    One day,the police caught him.Before he____(put) in prison,he begged the police to meet his mother.They took him____his mother.As soon as he saw his mother,he suddenly bit her ear.“Ouch!What is the matter with you?”She finally scolded him.Her son answered.“If you had given me a scolding like that when I stole the first bag,I could not ____a thief.”____ (look) at her son heading to prison,“If only I____turn back time,I would scold him severely.”She said____(regret).

— You can have any prize if you win the game.

— Really?

下列饮食***衡膳食基本要求的是（ ）