When prehistoric man arrived in new
parts of the world, something strange happened to the large animals: they
suddenly became extinct. Smaller species survived. The large, slow-growing
animals were easy game, and were quickly hunted to extinction. Now something
similar could be happening in the oceans. That the seas are
being overfished has been known for years. What researchers such as Ransom Myers
and Boris Worm have shown is just how fast things are changing. They have looked
at half a century of data from fisheries around the world. Their 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. According to their latest paper published in Nature, the
biomass of large predators (animals that kill and eat other anima A. (A) management efficiency B. (B) biomass level C. (C) catch-size limits D. (D) technological application
更多"When prehistoric man arrived in new"的相关试题:
[单项选择]
When prehistoric man arrived in new
parts of the world, something strange happened to the large animals: they
suddenly became extinct. Smaller species survived. The large, slow-growing
animals were easy game, and were quickly hunted to extinction. Now something
similar could be happening in the oceans. That the seas are
being overfished has been known for years. What researchers such as Ransom Myers
and Boris Worm have shown is just how fast things are changing. They have looked
at half a century of data from fisheries around the world. Their 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. According to their latest paper published in Nature, the
biomass of large predators (animals that kill and eat other anima A. (A) large animals were vulnerable to the changing environment B. (B) small species survived as large animals disappeared C. (C) large sea animals may face the same threat today D. (D) slow-growing fish outlive fast-growing ones
[单项选择]When prehistoric man arrived in new parts of the world, something strange happened to the large animals. They suddenly became extinct. Smaller species survived. The large, slow growing animals were easy game, and were quickly hunted to extinction. Now something similar could be happening in the oceans. That the seas are being overfished has been known for years. What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing. They have looked at half a century of data from fisheries around the world. Their 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. According 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. In some long fished areas, it has h A. large animals were vulnerable to the changing environment B. small species survived as large animals disappeared C. large sea animals may face the same threat today D. slow growing fish outlive fast growing ones
[单项选择]When was the man in New York A. About two years ago. B. About one year ago, C. About three years ago.
[单项选择]When is the man’s new appointment A. Monday morning B. 4:00 this afternoon C. Tomorrow at 9:00 a.m. D. 9:00 this evening
[单项选择]When did the man move into the new flat A. Church Street, Randwick. B. Randwick Street, Church. C. Walter Street, Randwick.
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