单项选择题
Questions 11 — 13 are based on the following passage about the differences of plants and animals. You now have 15 seconds to read Questions 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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