問題詳情

第 31 至 35 題為題組One of the most difficult things for a human to face is the loss of a limb. If a person loses an arm or aleg, he/she must be fitted with an artificial limb.The situation is very different for a starfish. If a starfish loses an arm, it can grow a new one.31 Snails can even regrow their heads—imagine what the world would be like if humans could dothat. But we can’t. Nor can we grow new limbs or even fingers. That’s why scientists are studying animalsthat can regrow body parts, that is, regenerate. 32Many different kinds of animals show some form of regeneration. Most of them are, however, limitedto the sort a lizard is capable of, like regrowing a lost tail. A cockroach can grow back a missing limb, butthe limb itself can’t generate a new cockroach. 33 Bidirectional regeneration, on the other hand,refers to a situation in which splitting of an animal will result in separate fully functional animals.34 Cut a hydra in half, and you’ll get two hydras. Cut it into four pieces, and you’ll get four.35 A single one can be cut into hundreds of pieces and each will grow back into a whole in aweek or so. Because of this remarkable ability, one planarian can be created over and over, giving it a sortof immortality. Whether this phenomenon can be achieved in humans will likely require years of research.
(A) Scientists call this unidirectional regeneration.
(B) Humans aren’t completely without regenerative talents.
(C) The same thing happens for lobsters, salamanders, and many other animals.
(D) When it comes to regeneration, few animals can equal the magic of the planarian.
(E) This type of regeneration is demonstrated in a few animals, such as hydras and sea stars.(F) They hope that this line of research will make regeneration possible in humans someday.
31

參考答案

答案：C
難度：困難0.396552
統計：A(7),B(12),C(23),D(6),E(10)

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