Nhận biết (M1)

Occurring in the constellation Coma Berenices, 38 million lightyears from Earth, SN 1940B was a __________ explosion of a massive star, which blasts large amounts of radiation, heavy elements, and debris into space—that was first detected by American astronomer Josef Johnson.

Which choice completes the text so that it conforms to the conventions of Standard English?

• A.

  supernova, the

• B.

  supernova. The

• C.

  supernova—the

• D.

  supernova: the