D.Bigger threat to life.
【解析】 细节理解题。根据第二段中的“The added distance is a considerable threat.”可知,多飞的行程对于一些候鸟来说是个很大的威胁。
【答案】 D
2.To complete the marathon migrations, some birds have to do the following except ________.
A.have a break in the Sahara
B.put on more weight
C.reduce the size of internal organs
D.fly at night to avoid the heat
【解析】 细节理解题。由第三、四段可知,一些候鸟为了完成马拉松式的迁徙路程需要做的事包括了B、C和D三项。故选A。
【答案】 A
3.What can we infer from the text?
A.Birds have to migrate from Africa to Europe in winter.
B.Global warming is bad for all birds worldwide.
C.Birds that are of small size don't need to migrate.
D.Some birds have to migrate unless they adapt to climate change.
【解析】 推理判断题。根据最后一段“A few—such as the Blackcap—have started to adapt by spending winters in Britain”可推知,候鸟若不能适应气候变化就必须迁徙到适合其生存的地方。
【答案】 D
4.What's the best title of the text?
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