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47. What is the main idea of the second paragraph? (A) High-tech billboards do not collect personal information. (B) People do not mind the billboards tested in Japan and in the U.S. (C) Advertisers are not senstive to people’s concerns about privacy. (D) People are worried about information collection initiated by companies using digital billboards.

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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