【单选题】
2. The types of science fiction mentioned in the lecture are ____.
A、
time travel and the ultimate threat of species extinction.
B、
the mysteries of artificial life and traveling around the world.
C、
the ultimate threat of alien invasion and future life.
D、
time travel, artificial life and the threat of alien invasion.
出自：西安科技大学-测绘工程-大学英语1
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