What is the main idea of the passage？
A. SBS now occurs and we'd better pay much attention to it.
B. SBS shares symptoms with many prevalent maladies.
C. Biological contaminants can cause a more persistent form. of SBS.
D. The classic case of chemical SBS occurred at EPA headquarters.
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Commercial television programming is a kind of ______ communication.
A. point-to-point
B. point-to-multipoint
C. multipoint-to-point
D. multipoint-to-multipoint
Which chart shows the company's current income by country？
The Pacific was given its name because of ______.
A. not only the largest ocean but also the world's oldest and deepest
B. containing more than 80 percent of the earth's active volcanoes and most of its earthquake activity
C. the still of its waters, although it is occasionally swept by typhoons, and a number of strong currents circulate beneath the surface
D. the influence of the icy Antarctic continent and the smaller ratio of land to sea
In the last paragraph, the author tries to tell us ______.
A. learning is closely related to memory
B. psychologists are interested in the brain
C. psychologist are more interested in behavior
D. the relationship between learning, brain and behavior
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