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) A. rate
B. size
C. amount
D. percentage
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) A. as
B. as if
C. as though
D. since
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