Which of the following is TRUE of central pain？
A. It"s caused by the confusion of the brain.
B. It usually happens in some experiments.
C. It can be verified by the thermal grill illusion.
D. It can be felt when you touch cool objects.
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What does the underlined word "rival" in Para.6 mean？
A. Competitor.
B. Compete.
C. Match.
D. Compare.
What can we know about the Census of Marine Life？
A. The census helps us know more about the types and numbers of marine microbes.
B. Many scientists will participate in the census which will start on Oct. 4.
C. Nearly all new forms of marine life have been found in the census.
D. More marine life can be found if the census conducts more researches.
What can be inferred from the passage？
A. The deep sea area is full of different types of newly found creatures.
B. Findings of new creatures enable us to have a fresh look at the deep sea area.
C. The deep sea area has long been regarded as an area without life.
D. There is no difference between the deep sea area and tropical forests.
What is the focus of study for researchers at present？
A. Large marine creatures.
B. Tiniest marine creatures.
C. Deep-sea creatures.
Different types of roundworms.
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