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介入经导管血管内栓塞术常用的栓塞物有（）
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根据短文内容，从下列选项中选出能填入空白处的最佳选项。(选项中有两项为多余选项)First FlightMr Johnson had never been up in an airplane before and he had read a lot about air accidents, so one day when a friend offered to take him for a ride in his own small plane, Mr Johnson 6 . Finally, however, his friend persuaded him 7 , and Mr. Johnson boarded the plane.His friend started the engine and began to taxi onto the runway of the airport. Mr Johnson had heard that the most dangerous part of a flight was 8 , so he 9 and closed his eyes.After a minute or two he opened them again, looked out of the window of the plane, and said to his friend, "Look at those people down there. They look as small as ants, don"t they""Those are ants," answered his friend. "We"re still 10 ."A. was extremely frightenedB. in the skyC. was very worried about acceptingD. the take-off and the landingE. that it was happyF. on the groundG. that it was very safe （2）处填入（）
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