Scientific studies by experts prove that ______.
A. factors including quantum processes can prevent time travel
B. by changing quantum processes experts can make time travel come true
C. the theory of relativity can help change the nature of time travel
D. the time machine will turn out to be a piece of junk
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The word "perspective" underlined in Paragraph 5 most probably be replaced by ______.
A. viewpoint
B. attitude
C. conception
D. objection
The example of Abby Coyle indicates that ______.
A. all students take it for granted that they should be good at only one of the two subjects
B. one has to be good at both to get through school
C. it is students but not teachers who choose to put English and mathematics at opposite poles
D. it is possible for students to be good at both of the two subjects
The author's attitude towards the time machine is ______.
A. positive
B. negative
C. critical
D. enthusiastic
The information about the new mathematical theorem seems unreasonable in that ______.
A. it is given by the time traveler
B. it is written by the traveler's student
C. it still needs evidence t prove
D. it seems that there is no source of the information
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