Dafforn considers the discovery of the toxic chemicals in the trenches disturbing because—_________________
A. we are paying little attention to the impacts of sea exploration
B. we can't foresee how long the chemicals will influence our life
C. we have no idea about the source of the high levels of toxic chemicals
D. we don't know completely what impacts the chemicals may bring to us
查看答案
What does Jamieson suggest about how the pollutants get to the seafloor?
A. Fish spread the pollutants as they swim around in the deep ocean.
B. Plastic gets gradually dissolved in the ocean and fall to the seafloor.
C. Plastic in the ocean keeps the pollutants from getting to the seafloor.
Dead marine animals that have absorbed pollutants fall to the seafloor.
What have the scientists discovered about the amphipods?
A. They are trapped in the trench.
B. They live on organic pollutants.
C. They have been highly polluted.
D. They are identified as a new species.
What did Alan Jamiecson's team use the"lander"for?
A. Deep sea fishery and adventure.
B. Getting samples from the deep sea.
C. Testing water pressure in the trench.
D. Clearingaway the industrial pollutants.
What do we learn about the Mariana Trench?
A. It is the center of the world's ocean.
B. It has been affected by contamination.
C. It remains untouched by human activity.
D. It has been profoundly explored by scientists.
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