问答题

Our planet Earth is 4,600 million years old. If we reduce 【M1】______
this inconceivable time-span into an understandable concept, we
can liken the Earth with a person of 46 years of age. Nothing 【M2】______
is known about the first 7 years of this persons' life, and whilst
only scattered information exists about the middle span, we
know that only at the age of 42 did the Earth begin to flower.
Dinosaurs and the great reptiles did appear until one year 【M3】______

A.
B.
C.
【M1】
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