A. insightful B. huge C. immense D. quantity E. quality F. declined G. common H. greatly I. involved J. conc

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问题     A. insightful B. huge     C. immense   D. quantity   E. quality
    F. declined   G. common   H. greatly   I. involved   J. conclude
    K. breaking   L. knocking M. identical N. published  O. accounted
    According to a study【C1】________this week in the journal Ecology Letters, the【C2】________of birds in Europe has【C3】________by more than 20 percent in the past 30 years. While there were over 2.I billion European birds in 1980, there are now around 1.6 billion, says study co-author Rich Inger, an ecologist at the University of Exeter in the United Kingdom.
    Most of the decline—or 90 percent—is【C4】________for by a shrinking population in the 36 most common species, Inger tells Newsweek.
    For example, throughout the continent there are now 62 percent fewer house sparrows (家雀) than there were when Margaret Thatcher became prime minister, a decline of about 150 million animals, he says.
    There were also drops in the numbers of such【C5】________species as skylarks, grey partridges and starlings.
    The decline is likely due in part to habitat loss and pesticide use. The amount of land used for agriculture in Europe has【C6】________increased since 1980, and there are fewer places for birds to nest and find food, Inger says. At the same time, pesticide use has gone up,【C7】________down the number of "pests" like insects that birds prey upon, he adds.
    "We don’t manage the environment in a way that’s good for birds," Inger says. The study looked at an【C8】________amount of data collected by thousands of "citizen scientists" over 30 years in most countries in Europe, in "an【C9】________departure from conventional approaches to reviewing bird monitoring data," said Michael Wunder, an ornithologist at the University of Colorado-Denver who wasn’t【C10】________in the study.
【C7】

选项

答案L

解析 ________down the number of“pests”,根据语法规则,应该填现在分词,根据含义应该选knocking“敲;打”。故选L。
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