43.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.
44.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.
45.Why do some birds thrive in noisy environments?
A. Because there are fewer dangers.
B. Because there is more food to eat.
C. Because there is less light pollution
D. Because there are more places to take shelter.
8.【2015·四川】E
No one is sure how the ancient Egyptians built the pyramids near Cairo. But a new study suggests they used a little rock‘n’roll. Long-ago builders could have attached wooden pole s to the stones and rolled then across the sand, the scientists say.
揟echnically, I think what they抮e proposing is possible,?physicist Daniel Bonn said.tud
People have long puzzled over how the Egyptians moved such huge rocks. And there抯 no obvious answer. On average, each of the two million big stones weighed about as much as a large pickup truck. The Egyptians somehow moved the stone blocks to the pyramid ,site from about one kilometer away.
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