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【单选题】
脉搏短绌常见于A.
甲状腺功能进的病人
B.
甲状腺功能减退的病人
C.
主动脉狭窄的病人
D.
主动脉瓣关闭不全的病人
E.
心房颤动的病人
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【简答题】With the world’s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are already dealing with the impact this increase will have on everything from f...
【单选题】World population will continue rising from the current 5 billion until about 2050, but if the trends of the 1980s continue, it will ______ at about 9 billion.
A.
level up
B.
level off
C.
level on
D.
level down
【简答题】听力原文：By 2050, 25 percent of all Americans will be older than 65, up from 14 percent in 1995. The change poses profound questions for government and society. But it also creates career opportunities in...
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