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  3. Scientists have discovered a powerful antibiotic in the blood stream of giant pandas that can destroy bacteria. The Chinese rese

Scientists have discovered a powerful antibiotic in the blood stream of giant pandas that can destroy bacteria. The Chinese rese

admin2023-02-14  107
问题     Scientists have discovered a powerful antibiotic in the blood stream of giant pandas that can destroy bacteria. The Chinese researchers discovered the【C1】________ known as cathelicidin-AM, after【C2】________the panda’s DNA. It’s thought that the antibiotic is【C3】________by the bear’s immune system in order to protect them from infections.
    The scientists found that cathelicidin-AM killed bacteria in less than an hour【C4】________other antibiotics took more than six hours. They now want to develop the substance as a new drug to fight superbugs.
    The【C5】________bears, of which there are just 1,600 in the wild, have become a symbol for conservation—and now there could be a new reason to try and protect them.【C6】________, scientists will not need to rely on the animal’s unreliable breeding ability to【C7】________the new antibiotic, as they have been able to make it artificially in the lab by decoding the genes to produce a small molecule known as a peptide.
    Dr Xiuwen Yan, who led the research at the Life Sciences College of Nanjing Agricultural University in China told the Daily Telegraph: "It showed potential antimicrobial activities against wide【C8】________of microorganisms including bacteria, both standard and drug-resistant【C9】________. Under the pressure of increasing microorganisms【C10】________ drug resistance against conventional antibiotics, there is【C11】________need to develop new type of antimicrobial agents. Gene-encoded antibiotics play an important role in immune system against【C12】________microorganisms. They cause much less drug resistance than conventional antibiotics."
    Panda populations have decreased【C13】________the destruction of their natural habitat and bamboo food【C14】________ in China and south east Asia.【C15】________to increase then-numbers, including efforts at Edinburgh Zoo with resident pandas Tian Tian and Yang Guang, have been【C16】________for the extreme difficulty in getting them to breed in captivity.【C17】________in the wild, pandas【C18】________to breed easily, as the females only come into season once a year.
    It has been【C19】________that the millions of pounds spent in using expensive artificial breeding techniques could be put to better use on other conservation projects. And this new discovery is likely to【C20】________the case to save the endangered creatures.
【C14】
选项 A、qualities
B、safeties
C、transport
D、supplies
答案D
解析 bamboo food前的and提示本短语和熊猫自然栖息地的破坏同为前面提到熊猫种群数量减少的原因。竹子为熊猫的主食，能导致熊猫数量减少的原因应该是食物不足，D项supplies意为“供应”，语义符合。A项qualities和B项safeties分别表示“质量”和“安全”，前面提到熊猫的natural habitat(自然栖息地)，说明这里是自然环境下的熊猫，所吃的竹子也是自然生长的，不存在食品质量或安全问题。C项transport食品运输不是大熊猫数量减少的原因。
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