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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.
【C12】
选项 A、expectation
B、victim
C、driver
D、result
答案C
解析 空格所在部分需要填入一个名词。空格前出现了逻辑关系词but，但是此处but表示的不是转折，而是一种程度的加深：栖息地的减少要担负部分责任，但主要________是偷猎行为。由此可知前后两种行为都是导致动物灭绝的原因，所以此处空格需要填入一个与 “原因”意思相近的单词。观察对比选项，只有C项driver(驱动因素)符合条件，即“主要的驱动因素是盗猎行为”。A项expectation(期待)，与文章主题负向的感情色彩相反，而且与后面的illegal hunting(偷猎)搭配不符合文章主题，故排除。B项victim(受害者)、选D项result(结果)，两个词都有“结果”的含义，但偷猎是原因，填入后因果倒置，故排除。
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