2. 外语
  3. Our planet Earth is 4,600 million years old. If we reduce 【M1】______ this inconceivable time-span into an understandable con

Our planet Earth is 4,600 million years old. If we reduce 【M1】______ this inconceivable time-span into an understandable con

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问题     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】______
ago, when the planet was 45. Mammals arrived only 8 months
ago; in the middle of last week man-like apes revolved into      【M4】______
ape-like men, and at the weekend the past ice age enveloped      【M5】______
the Earth.
   Modem man has been around for 4 hours. During the last
hour Man discovered the agriculture. The industrial revolution
began a minute early. During those sixty seconds of biological   【M6】______
time, Modem Man made a rubbish tip of the Paradise. He           【M7】______
has multiplied numbers to plague proportions, caused the         【M8】______
the extinction of 500 species of animals, ransacked the
planet of fuels and now stands like a brutish infant, gloating   【M9】______
over his meteoric rise to ascendancy, on the near brink of a    【M10】______
war to end all wars and of effectively destroying this oasis of
life in the solar system.
【M5】
选项
答案the past ice age改成last
解析 通过上下文及基本常识，我们知道，最后一个冰川时期(the last ice age)是出现在一百万年前，也就是作者比喻的(上)周末。the past ice age是“过去的一个冰川时期”的意思。
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