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【单选题】
某地区常年栖息着 30 鸟类,其中灰掠鸟占了最大优势,数量达 10 之多.灰掠鸟是农林害虫的天敌,喜好群体活动,常集结成庞大的鸟群在天空盘旋,形成壮观的风景.该地区为打造灰掠鸟品牌,计划在林区大规模清除其他树种,并改种灰掠鸟喜居的树种,欲招引 20 以上灰掠鸟,该计划的实施将使该区 ( 11 海南卷)
A.
灰掠鸟种内竞争必然减弱
B.
鸟的种类必然增加
C.
农林害虫数量必然大幅度上升
D.
生态系统的结构必然发生变化
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【单选题】My uncle went to Australia last year. We haven't seen him ______. [     ]
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【单选题】Almost since the beginning of mankind, governments have been recording the numbers of their populace. The first known census report took place in 3800 B. C. in Babylonia for the purpose of deciding wh...
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相关题目：
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has begun
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had begun
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