题目内容：
Questions 11-13 are based on the following passage．You now have l5 seconds to read Ques-tions 11-13．What is the most fundamental difference between plants and animals? A．Plants produce their own food but animals don’t．
B．Plant cells have a wall which is non-living in chemical nature but animal cells haven’t．
C．Plants are green but animals aren’t．
D．Plants can’t move but animals can．
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