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請依下文回答第 21 題至第 25 題:
In a remarkable—if likely controversial—feat, scientists announced today that they have created the first
successful human-animal hybrids. The project proves that human cells can be 21 into a non-human organism,
survive, and even grow inside a host animal, in this case, pigs. This biomedical advance has long been a dream for
scientists hoping to address a critical 22 of donor organs.
Every ten minutes, a person is 23 the national waiting list for organ transplants. And every day, 22 people
on that list die without the organ they need. What if, 24 relying on a generous donor, you could grow a custom
organ inside an animal instead?
That’s now one step 25 reality, an international team of researchers led by the Salk Institute reports in the
Cell. The team created what’s known scientifically as a chimera: an organism that contains cells from two
different species.
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請依下文回答第 26 題至第 30 題:
Many studies have shown that musical training can enhance language skills. However, it was unknown whether
music lessons improve general cognitive ability, leading to better language proficiency, or if the effect of music is more
specific to language processing. A new study has found that piano lessons have a very specific effect on kindergartners’
ability to distinguish different pitches, which translates into an improvement in discriminating between spoken words.
However, the piano lessons did not appear to confer any benefit for overall cognitive ability, as measured by IQ, attention
span, and working memory.
Previous studies have shown that on average, musicians perform better than nonmusicians on tasks such as reading
comprehension, distinguishing speech from background noise, and rapid auditory processing. However, most of these
studies have been done by asking people about their past musical training. The MIT researchers wanted to perform a
more controlled study in which they could randomly assign children to receive music lessons or not, and then measure
the effects. After six months, the researchers tested the children on their ability to discriminate words based on
differences in vowels, consonants, or tone (many Mandarin words differ only in tone). Better word discrimination usually
corresponds with better phonological awareness — the awareness of the sound structure of words, which is a key
component of learning to read. Children who had piano lessons showed a significant advantage over children in the extra
reading group in discriminating between words that differ by one consonant. Children in both the piano group and extra
reading group performed better than children who received neither intervention when it came to discriminating words
based on vowel differences.