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The everyday observation mentioned in the passage is related to ................. .

  • A.The tendency of a standing person to fall when a bus or train moves suddenly
  • B.The movement of a bus or train
  • C.The passengers standing in a bus or train
  • D.The sudden start of a train

Answer: A

The everyday observation is the tendency of a standing person to fall when a bus or train moves suddenly.

The passage poses the problem of writing legibly when table, pen and paper all move, and says its solution lay in an everyday observation: Why does a person standing in a bus or train tend to fall when a sudden start is made? It is because his feet move on, but his head stays still. The point is that the heavy, still part (the head, and in a seismograph the suspended mass) lags behind the moving base.

The movement of the vehicle, the passengers standing in it and the sudden start of the train are all parts of the scene, but the observation itself is about the person's tendency to fall, so only the first option states it.

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