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1 . 这个生物对成熟果实的喜爱，有别于它的史前祖先。（distinguish) （汉译英）
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2 . Scientists believe that these settlers crossed the Bering Strait in the Arctic to America ______ ______ ______ a land bridge ______ existed in ______ times. (根据课文内容填空)
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3 . Exactly when the first people ___________ we now know as California, no one really knows. Scientists believe that these settlers crossed the Bering Strait in the Arctic to America by means of a land bridge ___________ . (根据句意填空)
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