【单选题】听力原文: The U.S. Space Agency NASA says Russia's orbiting Mir space station has lost its primary and backup oxygen sources. If the problem is not fixed, the 3-member crew would have to abort the mission...
A.
It has lost its primary oxygen sources.
B.
It has lost its backup oxygen sources.
C.
It has lost both the primary and the backup oxygen sources.
D.
It has lost neither the primary or the backup oxygen sources.
【单选题】听力原文: The U. S. Space Agency NASA says Russia's orbiting Mir space station has lost its primary and backup oxygen sources. If the problem is not fixed, the 3 - member crew would have to abort the miss...