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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What is the author's atitude toward deep sea mining?
A. Objective.
B. Pessimistic.
C. Suspicious.
D. Indifferent.
What does the author mean by saying "blunt the sharp edge of enthusiasm” (Para. 4) ?
A. Put a stop to the deep sea mining projects.
B. Solve the conflicts among deep sea miners.
Cool down the craze of deep sea exploitation.
D. Recognize the enthusiasm towards the ocean.
What has Nautilus Minerals done with deep sea mining?
A. It has made great investment in the mining machines.
B. It has initiated the scientific exploration of the deep sea.
C. It has made critical contributions to the deep sea assessment.
D. It has put some energy into analyzing the deep sea ecosystem.
What do we learn about deep sea mining?
A. Deep sea mining has generated great benefits to our life.
B. Deep sea mining has posed a serious threat to ocean systems.
Cost-effective technology for deep sea mining has been developed.
D. A perfect penalty system for deep sea mining has been established.
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