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  3. Scientists in the UK have announced that the piranhafish’s reputation【C1】________a fearsome 【C2】________may well not be des

Scientists in the UK have announced that the piranhafish’s reputation【C1】________a fearsome 【C2】________may well not be des

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问题     Scientists in the UK have announced that the piranhafish’s reputation【C1】________a fearsome      【C2】________may well not be deserved. The fish, which is found in the Amazon in Brazil,   have been【C3】________as deadly carnivores (食肉动物) that work in shoals to overwhelm their prey and strip it of its flesh in seconds.
    However, experts【C4】________St Andrews University say that piranhas are omnivores(杂食动物)that mainly eat fish, plants and insects. They form big groups not to hunt but to defend 【C5】________against other predators, according to the team.
    " Previously it was thought piranhas shoaled as it【C6】________them to form a cooperative hunting group," said Professor Anne Magurran. "【C7】________, we have found that it is primarily a defensive behavior."
    Piranhas can be attacked by animals【C8】________dolphins, caimans and large fish, so forming a shoal is a good way of【C9】________being killed. Piranhas of【C10】________age stay in the middle of the group for【C11】________and the【C12】________of the shoal differs according to the level of【C13】________. When the water level is【C14】________, the fish form small groups as there is space to escape, but when the water level drops, they form large groups as protection【C15】________predators.
【C10】
选项 A、reproduce
B、reproductive
C、reproduction
D、reproductively
答案B
解析 由此往后连起来看，大意是食人鱼的群体组合是根据所面临的危险，根据水的深浅。并且，处于繁殖期的鱼处于鱼群的中央，以获得保护。Of后应跟名词性词组，age前应有形容词修饰。Reproduce是动词，reproductive是形容词，reproduction是名词，reproductively是副词。选项B是正确的。Reproductive age繁殖期。
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