So many end up in tree branches or along highways-|||-that a growing number of cities do not allow them at checkouts(收-|||-银台).The bags are prohibited in some 90 cities in California,-|||-including Los Angeles.Eyeing these headwinds,plastic-bag-|||-makers are hiring scientists like Stein to make the case that their-|||-products are not as bad for the planet as most people assume.-|||-25.What does the word "headwinds" in paragraph 2 refer to?-|||-A.Bans on plastic bags.-|||-B.Effects of city development.-|||-C.Headaches caused by garbage.-|||-D.Plastic bags hung in trees.

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