A few years ago, a child was lost in the woods. He was out with his brothers and sisters gathering berries, and was accidentally separated from them, and lost. The children, after looking in vain (徒劳地) for some time in search of the little wanderer, returned, just in the dusk of the evening, to tell their parents that their brother was lost and could not be found.
The woods, at that time, were full of bears. The darkness of a cloudy night was rapidly coming on, and the alarmed father, gathering a few of his neighbors, hurried to search for the lost child. The mother remained at home almost distracted with suspense (心神不宁).
As the clouds gathered, and the darkness increased, the father and neighbors with highly excited fears went across the woods in all directions and raised loud shouts to attract the attention of the child.
But their search was in vain. They could find no trace of the wanderer and as they stood under the branches of the tall trees and listened, they wished they might hear his weak voice. However, no sound was brought to their ears, except the strong wind as it swept through the thick branches of the forest.
The gathering clouds threatened an approaching storm, and the deep darkness of the night had already enveloped them. It was difficult to imagine what the feelings of that father were. And who could imagine how deep the worry is, which filled the heart of that mother, as she heard the wind and looked at the darkness in which her child wandering?
The search was continued in vain till nine o’clock in the evening. Then , one of the parties was sent back to the village, to collect the villagers for a more extensive (广泛的) search. Every heart sympathized in the sorrows of the anxious parents. Soon groups of the people were seen climbing the hill. Before long, the rain began to fall, but no news came back to the village of the lost child. Hardly an eye was that night closed in sleep, and there was not a mother who did not feel for the parents.
Paragraph I
The night passed away, and the morning dawned, and yet no news came.
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Paragraph II
About seven in the morning, villagers made arrangements for a final search.
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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

