题型：语法填空（语篇） 题类：模拟题 难易度：困难
山东省临沂市2019届高三英语2月教学质量检测试卷（音频暂未更新）
They had been on (we)planets for millions of years, but 2018 was the year several species (official)died off forever. Three bird species went extinct this year, two of are songbirds from northeastern Brazil. A (disturb)trend is that mainland species are starting to go extinct, rather than island species.
The species (wipe)out in the wild resulted from many factors such as the creation of dam and trapping trade. Beyond birds, other animals such as the vaquita and the northern white rhino (be)near the end. We are currently experiencing the worst species die—offs since the (lose)of the dinosaurs 65 million years ago.
Although extinction is a (nature)phenomenon, it occurs at a rate of about one to five species per year. Scientists estimate we're now losing species at 1,000 to 10,000 times the rate. In the past 500 years, about 1,000 species (go)extinct.
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