YDS

Practice session

Choose the sentence that interrupts the account of how a new astronomical observation changes a model: '(I) The telescope detected distant galaxies brighter than the team's model predicted. (II) The team first checked whether calibration errors could explain the discrepancy. (III) The observatory also runs popular evening tours for local schools. (IV) After those checks, the discrepancy persisted. (V) The researchers therefore began revising the assumptions used in their model.'

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