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Questions16to18arebasedonthepassageyouhavejustheard.16.A)Theyhavesmallroots.B)Theygrowwhiteflowers.C)Theytastelikeapples.D)TheycomefromCentralAfrica.17.A)Theyturnedfromwhitetopurpleincolor.B)Theybecamepopularontheworldmarket.C)Theybecameanimportantfoodforhumans.D) Theybegantolooklikemodern-daycarrots.18.A)Theywerefoundquitenutritious.B)Therewereseriousfoodshortages.C)Peoplediscoveredtheirmedicinalvalue.D)Farmmachineshelpedlowertheirprices.

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