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and it has to be recognized in many different parts of the world，\said Haywood， who wasn't involved in the new study．
One candidate for the market is the distinctive radioactive signature left by atom bomb tests， which began in 1945． \（沉降 ） is basically across the world，\Haywood said． In a similar way， scientists used traces of the element iridium （铱） left by shooting star strikes to help define the boundary between the Cretaceous and Tertiary periods﹣﹣﹣the time of the great dinosaur extinctions．
The push for a formal declaration of the Anthropocene age is about more than just scientific curiosity． The move the scientists write in the last issue of the journal Environmental Science & Technology， \be used as encouragement to slow carbon emissions and biodiversity（生物多样性）loss\on protection measures\， by underlining how much we're changing the environment， the formalization would be \very powerful statement\．
（1）Which of the following is TRUE about the new paper？ C A． It denies the existence of the Holocene age． B． It documents the recent human impacts on earth．
C． It pushes for the formalization of the Anthropocene age． D． It serves as a warning against the current mineral exploitation． （2）Haywood's words in paragraph 4indicate that B ．
A． the key to formalizing the new age is to find a deposit record set in stone B． the marker has to appear in various places globally to be considered valid C． finding a marker is a straightforward way to define the beginning of an age D． future geologists may find it hard to recognize the markers we choose today （3）What can you infer from the passage？ C
A． The element iridium may work as a marker for the Anthropocene age． B． The Nobel Prize winner Crutzen invented the