《2025年新课程学习与检测九年级英语全一册人教版》

B
Dinosaurs once lived on the earth for a long time. They suddenly disappeared millions of years ago. What happened to them? That’s still a mystery. People never stop searching for the answer.
Some US scientists say it is because there were not enough male(雄性的) dinosaurs. They got this idea after researching crocodiles(鳄鱼).
Mother crocodiles lay eggs and later baby crocodiles come out. The local temperature decides the sex of the baby crocodile. When the eggs are at a temperature of 26 ℃ to 30 ℃, the babies are all girls; when the temperature is 30 ℃ to 34 ℃, there are both boys and girls; when it is 34 ℃ to 36 ℃, only boys are born.
Dinosaurs’ babies also came from eggs. So scientists have given us a new picture: Millions of years ago, it suddenly became very cold. Almost all dinosaur babies were girls. There were fewer and fewer male dinosaurs. Mother dinosaurs could not give birth to more babies. Finally, these powerful animals disappeared.
26. 根据英文释义及首字母提示拼写单词。
①eenough as many or as much as necessary
②llay to produce eggs from the bodies of birds, insects and so on
27. 完成同义句转换,每空一词。
Dinosaurs’ babies also come from eggs.
Dinosaurs’ babies come from eggs as well.
28. When did dinosaurs suddenly disappear?
29. What decides the sex of the baby crocodile?
30. Are the baby crocodiles only boys when it’s 35 ℃?

答案： 26.①enough ②lay 27.as well 28.Millions of years ago. 29.The local temperature. 30.Yes, they are.