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  3. Scientists in the UK have announced that the piranhafish’s reputation【C1】______a fearsome【C2】______may well not be deserved. The

Scientists in the UK have announced that the piranhafish’s reputation【C1】______a fearsome【C2】______may well not be deserved. The

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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.
【C3】
选项 A、told
B、saying
C、describing
D、portrayed
答案D
解析 Tell告诉，say说，describe描述，portray描绘。文中have been表明是被动语态，应选择过去分词；根据上下文，这种鱼已被描绘成致命的食肉动物。选项D是正确的。
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