问题
单项选择题 A1型题
人群疾病的自然史研究，可见于下列哪项研究（）。
A.病例对照研究
B.实验研究
C.横断面研究
D.队列研究
E.类实验研究
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
人群疾病的自然史研究，可见于下列哪项研究（）。
A.病例对照研究
B.实验研究
C.横断面研究
D.队列研究
E.类实验研究
参考答案：D
完形填空（共20小题，每小题1.5分，满分30分） When Wilson got to the airport, 36 flight was already being called 37 the loudspeakers. The day before he had given up his 38 for a morning flight and had booked（预定）an afternoon 39 instead. He had to go to the reservations（预定）desk to collect his 40ticket. He apologized for being 41.The reservations clerk（预订票的职员）smiled and began to look through the reservations in front of her. Then her 42 disappeared and 43 began to look 44 . “Your ticket doesn’t seem to be here, ” she said. “Let me check it with the computer. ”The 45 clicked（滴答声）and whirred（飕飕声）and 46 began to flash 47 , his flight was called a second time. Wilson became very 48 . 49 the girl looked 50 . “There’s been a mistake. Your new ticket was sent to you by post. That’s why it isn’t here”, she said. 51 took her only a 52 time to write 53 a new one. Wilson managed to catch the plane just before it took 54 . “What a way to start a 55 !” he thought.
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