根据下面内容，回答题： Scientists in the UK have announced that the piranhafish-考呗网题库移动版

单选题根据下面内容，回答题：
Scientists in the UK have announced that the piranhafish's reputation 21 a fearsome 22 may well not be deserved. The fish, which is found in the Amazon in Brazil, have been 23 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 24 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 25 against other predators, according to the team.
"Previously it was thought piranhas shoaled as it 26 them to form a cooperative hunting group," said Professor Anne Magurran. " 27, we have found that it is primarily a defensive behavior. "
Piranhas can be attacked by animals 28 dolphins, caimans and large fish, so forming a shoal is a good way of 29 being killed. Piranhas of 30 age stay in the middle of the group for 31 and the 32 of the shoal differs according to the level of 33 When the water level is 34, the fish form small groups as there is space to escape, but when the water level drops, they form large groups as protection 35 predators.

A．as
B．as if
C．as though
D．since

参考答案A

解析:【原文大意】
英国科学家公布，食人鱼作为可怕的杀手的名声很可能是不该它们承受的。在巴西亚马逊河发现的鱼被描述成致命的食肉动物，这种鱼成群地覆盖它们的猎物，并在几秒钟内剥光它的肉体。
然而，来自圣安德鲁斯大学的专家们说食人鱼是杂食动物，它们的主要食物是鱼、植物和昆虫。它们组成大的群体不是为了猎物，而是为了依靠群体的形式保护自己，防范其他的捕猎者。Anne Magurran教授说：“以前，人们认为食人鱼之所以成群结队是因为这样可以有利于它们合作猎物。然而我们发现，这种形式主要是一种防御行为。”
食人鱼会被其他的动物攻击，例如，海豚、凯门鳄以及大鱼。因此，组成鱼群是一个避免被吞噬的很好的方法。它们将处于繁殖期的食人鱼围在鱼群的中间使其受到保护，食人鱼群的大小基于危险的程度。水位高时，鱼群比较小，因为有足够的空间逃跑。但是，当水位下降时，它们会组成大的鱼群以抵御捕猎者。
【解析】
看22题的四个选项可以断定这里指食人鱼是什么样的杀手。应当选择具有“作为”含义的词。选项A是正确的：作为可怕的杀手。

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