George Johnson started to invest in internet companies because the internet
A. already had considerable educational value.
B. was increasingly popular in Europe.
C. was becoming easier to use.
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Which of the following statements is NOT true according to the passage？
A. Usually SBS can be easily paid little attention to.
B. SBS can occur in all the new buildings.
C. SBS mostly happens in a poorly ventilated, airtight building.
D. SBS is said to be caused by one of two general categories of pollution.
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.
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？
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