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48. Why is Google mentioned in the passage? (A) It is an example of a search engine that sells information to companies. (B) It is better than other search engines in gathering information. (C) It has started using high-tech billboards to get information. (D) It plans to develop better ways to profile Internet users.

49. According to the passage, a Bing user is likely to when looking for travel information. (A) be exposed to ads for hotels (B) become a pilot (C) refuse to see ads on the airline’s website (D) be offered discounts on shoes and clothing

50. What is the reason for advertisers using high-tech billboards? (A) It is cheaper to make high-tech billboards. (B) Advertising effects of digital billboards are mixed. (C) People tend to ignore ordinary advertisements. (D) Billboards are not placed in good locations.

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