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小麦收获田间测产的结果是:每亩穗数是 40 万,每穗粒数是 30 粒,千粒重是 40 克,求每亩理论产量是 ( ) 公斤?(保留整数)
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【单选题】听力原文： America's national symbol—the Bald Eagle—almost went extinct 20 years ago. But it has made a comeback In fact, the US Fish and Wildlife Service is considering the possibility of taking it off th...
A.
It limited their supply of food.
B.
It made their eggshells too fragile.
C.
It destroyed many of their nests.
D.
It killed many baby bald eagles.