13. Quasars _____ emitting extremely intense radio waves and visible radiation.(A) are star-like obj

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13. Quasars _____ emitting extremely intense radio waves and visible radiation.
(A) are star-like objects
(B) star-like objects are
(C) star-like, they are objects
(D) are they star-like objects

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上一篇 : 12. For centuries, St. Paul’s, the domed 17th-century cathedral, was the _____ structure in London a
下一篇 : 14. _____ struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period

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