請依下文回答第 41 題至第 45 題: An endangered animal or plant is a species that is considered in immediate danger of becoming extinct. Its
population is very small and it needs active 41 to survive. Extinction has occurred throughout history, but
increased dramatically in recent times due to the growth of the human population. The species extinction rate is now
one species per day, which will lead to a dramatic decrease in the 42 of life on earth.
Many marine mammal scientists are now becoming concerned with the drop in numbers of dolphins. River dolphins
that live in Asia and the Amazon are 43 due to dam building and habitat destruction. Another concern is the
number of dolphins dying in the tuna fisheries of the eastern tropical Pacific. Historically, yellow-fin tuna has been
caught by encircling the dolphins that swim above the tuna with purse seine nets. Over 100,000 dolphins per year died
in the 1970s and early 1980s after being caught in tuna nets, and several species of dolphins in the eastern tropical
Pacific are now considered 44 under the Marine Mammal Protection Act. Efforts of environmental organizations
and consumers led to "dolphin-safe" labeling of canned tuna, and a 98% reduction in dolphin 45 since 1990.
However, recent changes in US and international laws have reopened this complex issue, and the outcome is in doubt.
Fortunately, the major companies have all promised to sell only tuna that is caught without encircling dolphins.
【題組】42
(A) adversity
(B) diversity
(C) necessity
(D) intensity