A. Concerned citizens and scientists have begun to take action. A wide range of solutions is being proposed to stop the destruction of biodiversity at the regional as well as the global level. Since 1985,the effort has become more precisely charted, economically efficient, and politically sensitive.
B. The new biodiversity studies will lead logically to an electronic encyclopedia of life designed to organize and make immediately available everything known about each of the millions of species. The industrialized countries will lead for a time. However, the bulk of the work must eventually be done in the developing countries. The latter contains most of the world species, and they are destined to benefit soonest from the research. The technology needed is relatively inexpensive, and its transfer can be accomplished quickly. The discoveries generated can be applied directly to meet the concerns of greatest importance to the geographic region in which the research is conduct
A. Concerned citizens and scientists have begun to take action. A wide range of solutions is being proposed to stop the destruction of biodiversity at the regional as well as the global level. Since 1985,the effort has become more precisely charted, economically efficient, and politically sensitive.
B. The new biodiversity studies will lead logically to an electronic encyclopedia of life designed to organize and make immediately available everything known about each of the millions of species. The industrialized countries will lead for a time. However, the bulk of the work must eventually be done in the developing countries. The latter contains most of the world species, and they are destined to benefit soonest from the research. The technology needed is relatively inexpensive, and its transfer can be accomplished quickly. The discoveries generated can be applied directly to meet the concerns of greatest importance to the geographic region in which the research is conduct
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
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