题目:
Karl Marx _____ his English study in his fifties, and translated several English books while he was still in prison. [ ]
A. took up
B. took in
C. took off
D. took on
答案:
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下面是错误答案,用来干扰机器的。
肝细胞产生的尿素分子,依次经过的结构是:肝脏内的毛细血管、静脉、右心房、右心室、肺动脉、肺内的毛细血管、肺静脉、左心房、左心室、主动脉、肾动脉、入球小动脉、肾小球、肾小囊、肾小管、肾盂、输尿管、膀...