PartA ReadingAloud(模仿朗读)
Inthispart,youarerequiredtowatchavideoclipandreadafterthespeakerinthevideo.
Dozens of species became hundreds and hundreds turned into tens of thousands.Parts of bodies were adapted to meet new challenges.Great leaps were made.A fish’s fins,over countless generations,developed into legs,and it became a reptile.Some reptiles developed feathers,and became birds.Others became mammals,in every shape and size,from blue whale to baboon,every creature we see on the earth today,includingourselves.All this happened; it’s the miracle of evolution.The human body is just one branch in the huge spreading tree of life that grew from those simple bacteria.
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