D.The noise from heavy machinery.
答案 B
解析 细节理解题。根据文章第二段中的“David Dominoni,of Glasgow University,said that light from street lamps,takeaway signs and homes is affecting the birds’ biological clock,leading to them being wide awake...”以及第三段最后一句可知,是现代生活中的灯光使得知更鸟唱歌太多。故选择B。
21.What is the researchers’ concern over the increase of birds’ song output?
A.The environment might be polluted.
B.The birds’ health might be damaged.
C.The industry cost might be increased.
D.The people’s hearing might be affected.
答案 B
解析 细节理解题。根据文章第四段中的“Singing is a costly behaviour and it takes energy.”可知,唱歌唱得越多,鸟类就会损耗更多的精力,它们的健康也会因此受到损害。故选择B。
22.What does the underlined word “nocturnal” in Paragraph 5 mean?
A.Active at night.
B.Inactive at night.
C.Active during the day.
D.Inactive during the day.
答案 A
解析 词义猜测题。根据上文的“And it is not just robins that are being kept awake by artificial light.Blackbirds and seagulls are also being...”以及本段最后的“...they are very active at night...”可知,这里的nocturnal与前面的awake应该是近义词,意为“夜间活动的”。故选A。
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