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发布时间：2006-06-23 11:57     点击：

(A) Houseplants can remove benzene from the air.

(B) Nonsynthetic products do not release toxins into houses.

(C) Keeping houseplants is an effective means of trapping heat in a poorly insulated house.

(D) Keeping houseplants can compensate for some of the negative effects of poor ventilation.

(E) The air in a well-insulated house with houseplants will contain fewer toxins than the air in a well-ventilated house without houseplants.

20. Normal full-term babies are all born with certain instinctive reflexes that disappear by the age of two months. Because this three-month-old baby exhibits these reflexes, this baby is not a normal full-term baby.

Which one of the following has a logical structure most like that of the argument above?

(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky.

(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk.

(C) Because humans are social animals and Henry is sociable, Henry is normal.

(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum.

(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal.

21. Efficiency and redundancy are contradictory characteristics of linguistic systems: however, they can be used together to achieve usefulness and reliability in communication. If a spoken language is completely efficient, then every possible permutation of its basic language sounds can be an understandable word. However, if the human auditory system is an imperfect receptor of sounds, then it is not true that every possible permutation of a spoken language’s basic language sounds can be an understandable word.

If all of the statements above are true, which one of the following must also be true?

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