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Many of us are interested in time travel and shuttling back and forth (来回地) to the past or the future. Who wouldn’t be enthralled by returning to the past or seeing the future? But time travel seems to be possible only in our imagination or in science fiction (科幻小说).

Science fiction is a world where impossible things can become possible and that’s why most of us like it. But science fiction is not entirely fiction since it is based on science theories (理论). Time travel, for instance, is a theme used by sci-fi writers. Readers may sometimes think writers have first-hand experience of it. I have collected some of the popular ways in which time travel is made possible in science fiction:

● Through the wormhole — A wormhole is a path between points in space-time. According to Einstein, an object can pass through a wormhole if it can travel at the speed of light. An example of a wormhole is described in Riddle of the Red Bible.

● Through a black hole — A black hole is a vacuum (真空) in space where light cannot even escape or pass through. In some sci-fi movies, like Star Trek, black holes became the means to travel through time.

● Through time machines — In science fiction, time machines are vehicles that can travel faster than light. It can be a strange vehicle like the TARDIS in Doctor Who or a special car like the one used in Back to the Future. But these special vehicles would need a wormhole to travel to the past or the future.

● Through parallel universe (平行宇宙) — Another popular way to travel through time is to be able to get into a parallel universe where one can go back to a point in time and see a different reality.

Though we know time travel may not be possible, it is still an entertaining subject and a heated topic for most of us. And in science fiction, where reality is always in the imagination, time does not really matter.

1.The underlined word “enthralled” in Paragraph 1 probably means “_____”.

A. defeated B. confused

C. shocked D. attracted

2.What can we learn from the passage?

A. Time travel might become possible in the far future.

B. Time machines can’t travel to the past or the future without a wormhole.

C. Sci-fi writers have similar experiences to those they describe in their fiction.

D. An object can travel to the past or the future when its speed is faster than light.

3.What is the author’s purpose in writing this passage?

A. To arouse the heated topic of time travel among readers.

B. To introduce how humans travel through time in science fiction.

C. To introduce the author’s knowledge of time travel to the readers.

D. To compare different ways of time travel mentioned in some science fictions.

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