問題詳情

請依下文回答第 33 題至第 36 題  Many large birds possessing great powers of flight are, when not occupied with the business of raising theiryoung, constantly wandering from place to place in search of food. They fly at a great height, and cover tremendousdistances. In such regions as this, uncountable numbers of birds are, without doubt, constantly passing over us unseen.It was once the subject of very great wonder to me that flocks of black-necked swans should almost always appearflying by immediately after a shower of rain, even when none had been visible for a long time before, and when theymust have come from a very great distance. When the reason at length occurred to me, I felt very much disgusted withmyself for being puzzled over so very simple a matter. After rain a flying swan may be visible to the eye at a vastlygreater distance than during fair weather, the sun shining on its intense white feathers against the dark background of arain-cloud making it exceedingly conspicuous. The fact that swans are almost always seen after rain shows only thatthey are almost always passing.
33 According to the passage, why do birds frequently fly for a long distance?
(A) They like to fly.
(B) They are migrating.
(C) They are looking for food.
(D) They are looking for companions.

參考答案

答案：C
難度：適中0.591837
統計：A(0),B(14),C(29),D(5),E(0)

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