[填空题]
For a {{U}}wrong{{/U}} word, underline the wrong word and write the correct one in the
blank provided at the end of the line.
For a {{U}}missing{{/U}} word, mark the position of the missing word with a "∧" sign and
write the word you believe to be missing in the blank
provided at the end of the line.
For an {{U}}unnecessary{{/U}} word, cross the unnecessary word with a slash "—" and put the word
in the blank provided at the end of the line.

Among her fellow astronomers, Vera Rubin is known as an expert
observer of the night sky, one of the best. Her reputation derives from the
project she has doggedly pursued through most of her career: measuring how (1) ______
fast spiral galaxies are spinning, from their luminous cores out of the fain

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