鹰
猫头鹰和黄豆关系密切。春天,农民在地里播下豆种,田鼠就偷吃豆种。当豆种从地里长出幼芽时,田鼠就啃吃嫩芽,使黄豆无法生长。秋天田鼠疯狂地啃咬豆荚,把大量黄豆拖回洞里。由此可知,田鼠不知毁了多少黄豆。猫头鹰是益鸟,是捕捉田鼠的能手。一只猫头鹰一年要捕捉几百只田鼠。这样,猫头鹰就保护了黄豆。
1.田鼠怎样糟蹋黄豆?2.为什么说猫头鹰和黄豆关系密切?
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2