6. Out-of-home advertising has become more effective because _______. (A)billboards can be replaced within two hours (B) consumers travel more now than ever before (C) such ads have been made much more attractive (D) the pace of urban life is much faster nowadays

60. The author believes that, since the signing of the Kyoto Protocol, ________. (A)politicians have started to do something to better the situation (B) few nations have adopted real tough measures to limit energy use (C) reductions in energy consumption have greatly cut back global warming (D) international cooperation has contributed to solving environmental problems

6. Out-of-home advertising has become more effective because _______.
(A)billboards can be replaced within two hours
(B) consumers travel more now than ever before
(C) such ads have been made much more attractive
(D) the pace of urban life is much faster nowadays

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