Digital PSAT Reading and Writing Practice Question 176: Answer and Explanation
Question: 176
Because emission spectra are unique to each element and constant throughout the universe, scientists are able to attach a spectrometer to a telescope, locate a celestial body, and ________________________
Which choice completes the text so that it conforms to the conventions of Standard English?
- A. determine, the chemical composition of that body simply, by comparing the resulting spectrum to those of known compounds on Earth.
- B. determine the chemical composition, of that body simply by comparing, the resulting spectrum to those of known compounds on Earth.
- C. determine the chemical composition of that body simply by comparing the resulting spectrum to those of known compounds on Earth.
- D. determine the chemical composition of that body, simply by comparing the resulting spectrum to those of known, compounds on Earth.
Correct Answer: C
Explanation:
(C) No commas are needed in this long, descriptive phrase. The other options are too choppy.
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