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The question below consists of a set of labeled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph. P. And because of the large distances, it takes them a long time to travel between the two. Q. Communicating with distant spacecraft is difficult. R. It can take up to 24 minutes for a signal to travel between Earth and Mars, for example, and almost an entire day to receive a signal sent by NASA's Voyager 1. S. The signals that pass between the spacecraft and ground stations are very weak.

  • A.RPQS
  • B.QPSR
  • C.QSPR
  • D.SQRP

Answer: C

The paragraph begins with the general statement in Q, that communicating with distant spacecraft is difficult. Sentence S then says why: the signals between the spacecraft and the ground stations are very weak. Sentence P adds that because of the large distances it takes them a long time to travel between the two, and R gives examples of the delay, 24 minutes to Mars and a day for Voyager 1. So the order is Q, S, P, R, option (C). The other orders either put the example R before the point it illustrates or open with a sentence that depends on something earlier.

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