黃金閱讀 34 EXTINCTION OF THE DINOSAURS - 英檢

※ 引述《kobejo4 (柯比‧萬)》之銘言：
: Paragraph 4 Dissatisfaction with conventional explanations for dinosaur
: extinctions led to a surprising observation that, in turn, has suggested a
: new hypothesis. Many plants and animals disappear abruptly from the fossil
: record as one moves from layers of rock documenting the end of the Cretaceous
: up into rocks representing the beginning of the Cenozoic (the era after the
: Mesozoic). Between the last layer of Cretaceous rock and the first layer of
: Cenozoic rock, there is often a thin layer of clay. Scientists felt that they
: could get an idea of how long the extinctions took by determining how long it
: took to deposit this one centimeter of clay and they thought they could
: determine the time it took to deposit the clay by determining the amount of
: the element iridium (lr) it contained.
: 8. In paragraph 4, all the following questions are answered EXCEPT:
: ○Why is there a layer of clay between the rocks of the Cretaceous and
: Cenozoic?
: ○Why were scientists interested in determining how long it took to deposit
: the layer of clay at the end of the Cretaceous?
answer:倒數第五行:"Scientists felt that they could get an idea of how long
the extinctions took"
: ○What was the effect of the surprising observation scientists made?
answer:第三行開始:"Many plants and animals disappear abruptly from the fossil
record as one moves from layers of rock documenting the
end of the Cretaceous up into rocks representing the
beginning of the Cenozoic (the era after the Mesozoic)"
: ○Why did scientists want more information about the dinosaur extinctions at
: the end of the Cretaceous?
answer:第一句話"Dissatisfaction with conventional explanations for dinosaur
extinctions"

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