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  3. A decade ago biologists identified a remote protected area in northern Laos, called Nam Et-Phou Louey, as the country’s probable

A decade ago biologists identified a remote protected area in northern Laos, called Nam Et-Phou Louey, as the country’s probable

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问题     A decade ago biologists identified a remote protected area in northern Laos, called Nam Et-Phou Louey, as the country’s probable last haven for wild tigers. To formally【C1】________ this supposition, researchers set up camera traps in 2013 and quickly【C2】________two tigers’ presence.【C3】________the success was short-lived: over their study’s four-year course, they never saw those or any other tigers again. This result proves that tigers are now functionally 【C4】________in Laos.
    The researchers also found that leopards, formerly presumed to still live in the park, have【C5】________as well. "For the remaining protected areas in Southeast Asia for tigers, this was an important one—maybe【C6】________a potential jewel in the crown," says senior author David Macdonald, a wildlife conservationist at the University of Oxford. "To find that that jewel has blinked out is devastating." Laos’s tiger loss is part of a(n)【C7】________trend across Southeast Asia; the animals have【C8】________disappeared from Vietnam and Cambodia. In almost every study site Macdonald and his colleagues have surveyed, wild tigers—which number fewer than 4,000 worldwide—are in steep【C9】________or completely absent. So are once【C10】________leopards.
    Habitat loss is partly to【C11】________. but Macdonald says that the main【C12】________is "the astonishing, destructive tide of illegal hunting." Akchousanh Rasphone from Oxford, and her colleagues installed and【C13】________300 camera stations across Nam Et-Phou Louey’s nearly 6,000 square kilometers of rugged, steep mountain ridges and【C14】________forest. Over four years they observed 43 mammal and bird species—but no leopards and, after 2013, no tigers.
    Leading international non-profit groups support Laos’s efforts【C15】________illegal hunting in its main protected areas, but as in many other countries,【C16】________still find ways to kill wildlife. "These findings are not at all surprising," says Ullas Karanth, a biologist at the Center for Wildlife Studies in Bengaluru. "There’s so much forest and so much【C17】________at this study site and throughout Southeast Asia, but without ground-level【C18】________against local people doing industrial-scale hunting, the wildlife will go." Tigers can【C19】________in human-dominated landscapes: India has the world’s second highest human population, but it has prioritized tiger【C20】________and now hosts two thirds of the planet’s remaining wild tigers.
【C8】
选项 A、already
B、sometimes
C、never
D、seldom
答案A
解析 空格所在部分需要填入一个副词，修饰disappeared(消失)。前文一直在表述老虎、豹子等动物几乎灭绝，且说明老虎消失是令人担忧的趋势，后文也提到野生老虎完全不存在了(completely absent)，所以空格处应该表述为已经消失，故选项心为正确答案。B项sometimes(有时)、C项never(从不)、D项seldom(几乎不)，均不符合上下文语境，故排除。
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