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humans, worms and rodents are different. most people are not willing to be put on a strict diet. the effect is not known. genetic changes in tissues can not be performed on humans.
B.C.D.四个选项中，选出可以填入空白处的最佳选项As we know, ________ have lived on Earth for ________ years.A. human; millions human; millions of humans; millions humans; millions of
humans can never regenerate limbs. humans might be able to regenerate limbs in the future. human limbs may be regenerated on some animals first. regeneration of human limbs will soon become a reality.
miracle cancer drugs often turn up unexpectedly. the mass media can wore wonders. curing cancers in mice is much easier than in humans. animals and humans are similar in behaviour.
take place instead of take the place substitute
began in began began to began with
although robots can do much dangerous and tiring work, humans are superior although humans are superior, robots can do much better in many areas of work robots will replace humans in more and more fields robots are superior to humans because they can do much work that humans can't do
are banned should ban be banned must ban
much more successful than modern ones. successful enough for humans to survive. successful in all cases. of little help to humans.
they assign to humans a controlling role in the word they reject the most workable model for both humans and nature their critique of preservationism is not well supported their program does not coincide with their principles
robots never complain about the tiring work the management can pay little and benefit a lot it is dangerous for humans to do some harmful work they have their own weaknesses and advantages
with that of us real humans to us real humans to that of us real humans with us real humans
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