单项选择题

This story is mainly about ______.

A．the distance between the sun and the other stars
B．the problems of traveling to faraway stars
C．what happens when we travel faster than the speed of light
D．the tool we use when we measure the distance of faraway stars

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单项选择题

According to the writer of the passage, psychological space needs ______.

A．are not affected by income at all
B．can hardly be changed altogether
C．can be changed if you make up your mind to do so
D．have nothing to do with cultural background

单项选择题

What is the author of the passage trying to tell the readers

A．Killers hardly ever seek forgiveness from their victims (牺牲品).
B．People can always justify whatever they have done wrong.
C．Boll and his wife take great pride in the success of the Manhattan Project.
D．Victory in war will never be gained without paying the price.