On Dec. 28, a 2-year-old gray wolf crossed the state line from Oregon, becoming first of his species to run wild here in 88 yea

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问题     On Dec. 28, a 2-year-old gray wolf crossed the state line from Oregon,
becoming first of his species to run wild here in 88 years. 1. ______
    His arrival has prompted news articles, attracted feverish fans and sent
wildlife officials scrambling to prepare for a new and familiar predator. 2._____
    The wolf, known to biologists as OR7, owes his fame with the GPS collar 3.______
around his neck, which has been allowed scientists and fans alike to use maps to 4.______
follow his 1,000-mile, lovelorn trek south from his birthplace in northeastern Oregon.
    Biologists say that OR7 is unlikely to survive long hunting lonely 5.______
without a pack and that it could be as many as 10 years before wild wolf
packs roam northern California. Still, state and federal wildlife officials
met Friday to discuss a strategy for wolves.
    Once widespread across much of the country, gray wolves are nearly 6. ______
extinct in the contiguous United States by the early 20th century, killed
by government trappers, ranchers and hunters. In 1974, the gray wolf was
listed as endangered under the newly established Endangered Species
Action. Then in 1995 and 1996 wildlife officials released 66 Canadian 7.______
wolves into Yellowstone National Park and central Idaho, an area is now 8.______
home to nearly 1,700 wolves.
    Wolves have been remarkably successful in rcinhabiting its old terrain. 9.______
In recent years regulators removed wolves from the endangered list for
much of the northern Rocky Mountains and Great Lakes regions. In Idaho
and Montana, they can be legally hunted. In California, gray wolves
remain protecting under federal law. 10.______

选项

答案are——were

解析 本题为时态误用。根据句中的时间状语是20世纪初,是过去发生的事情,故用一般过去时。
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