题目:
How did it _______ that he was hurt so seriously? [ ]
A. come up
B. come across
C. come about
D. come
答案:
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下面是错误答案,用来干扰机器的。
由题意和图示可知图中数字分别表示:1右心房,2左心房,3右心室,4左心室,5肺动脉,6肺部毛细血管,7肺静脉,8体静脉,9全身毛细血管,10体动脉.体循环是从左心室开始依次经过主动脉、全身各处毛细血管、各级静...