2. 外语
  3. Red giant stars do not become white dwarf stars abruptly; the process takes more than fifteen hundred years.

Red giant stars do not become white dwarf stars abruptly; the process takes more than fifteen hundred years.

admin2010-01-13  68
问题 Red giant stars do not become white dwarf stars abruptly; the process takes more than fifteen hundred years.
选项 A、suddenly
B、in unison
C、prematurely
D、accidentally
答案A
解析
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