PartA ReadingAloud(模仿朗读)
Inthispart,youarerequiredtowatchavideoclipandreadafterthespeakerinthevideo.
Our bodies are built from organized colonies of cells.In fact,what we see when we look at ourselves are vast communities of cells—billions of them.Each one plays a particular role—a heart cell,a muscle cell,a brain cell.In an incredible act of harmony and organization,they work together,performing the functions of the organ they belong to.From the very start of our lives,this tireless dedication to duty often requires our cells to die.Some cells in the fetus actually receive signals to self-destruct.
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