[练习册] PREP-SC2：121-140

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Changes in the composition of the light of a supernova--an exploding star--reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas.
  • reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas
  • reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding
  • not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas
  • not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding
  • reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding
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