A.To explain how birds benefit from migration.
B.To introduce how migrating birds find their way.
C.To tell some applications of migrating birds’ “V” formations.
D.To report new findings about migrating birds’ “V” formations.
答案:D
解析:写作意图题。本文围绕鸟类在迁徙途中为什么要排列成V字形展开叙述,因此本文的写作目的是报道关于鸟类迁徙途中排列成V形队列的新发现,因此选D项。
10.According to the recent study,when birds migrate, .
A.they don’t often change their lead birds during the whole journey
B.they fly in “V” formations to protect themselves against enemies
C.they form the shape of a “V” to make best use of the lifting effect
D.the air they stir around makes it hard for the birds behind to fly fast
答案:C
解析:推理判断题。关于鸟类迁徙的飞行,第三段说它们 “regularly switches leaders” (A项错);第二段说排V字形是为了 “use less energy” (B项错),本段还说使用V字形队列,鸟类飞翔的时候能够 “flies around the wingtips of another bird”,这样它们就能 “get a boost(向上一推) from the rising air and therefore use less energy to stay in the air” (D项错);由第四段中的 “to maximize the lifting effect while avoiding areas where the air moved downward” 可知,C项正确。
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