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18£®ÌýµÚ10¶Î²ÄÁÏ£¬»Ø´ðµÚ17ÖÁ20Ì⣮17£®What was the purpose of Columbus'first trip£¿
A£®To collect plants£®
B£®To look for gold£®
C£®To learn about American cultures£®
18£®Why does the corn feed millions of people today£¿
A£®It is delicious and cheap£®
B£®It can be cooked in many ways£®
C£®It grows easily in various conditions£®
19£®What did Columbus bring back on his second trip£¿
A£®Chocolate beans£®
B£®Fried potatoes£®
C£®Sweet corn£®
20£®What was the result of Columbus'two trips to America£¿
A£®They made native Americans enjoy European foods£®
B£®They made native American foods popular£®
C£®They made native American lifestyle well-known£®
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