题目内容：
According to this passage，which is not true about the construction of the robotic caterpillar?
A．A robotic caterpillar is made from a series of rubber capsules filled with a magnetic fluid． B．Iron particles，water，and a detergent-like surfactant form a magnetic fluid．
C．Each capsule filled with a magnetic fluid is linked to the next by a pair of rubber rods．
D．In order to keep stable condition，the caterpillar’s guts are wrapped in a clear，flexible polymer tube．
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答案解析：