段2：①That the seas are being overfished has been known for years. ②What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing. ③They have looked at half a century of data from fisheries around the world. ④Their methods do not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time. ⑤According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) in a new fishery is reduced on average by 80% within 15 years of the start of exploitation. ⑥In some long-fished areas, it has halved again since then.
32.We can infer from Dr. Myers and Dr. Worm’s paper that
[A] the stock of large predators in some old fisheries has reduced by 90%.
[B] there are only half as many fisheries as there were 15 years ago.
[C] the catch sizes in new fisheries are only 20% of the original amount.
[D] the number of large predators dropped faster in new fisheries than in the old.
答案：A
问：32题A选项中的has reduced by 90%是根据原文中的哪些内容结合在一起推断出来的？（多选题）
A : seas are being overfished has been known for years
B : estimate changes in that biomass over time
C : is reduced on average by 80%
D : it has halved again since then
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