《2025年基础知识同步训练10分钟八年级英语上册沪教版深圳专版》

B
If you go to the Gulf of Mexico, you can see there is a big hole. It is called Chicxulub Crater(希克伯石坑). Some people believe it was because of a huge asteroid (小行星) hitting this place, and the hit made dinosaurs die out millions of years ago.

This idea was first suggested in 1980. Later, scientists used special tools to find out what would happen if it was true. It showed that the asteroid could hit Earth at 40,000 miles per hour, leading to a big hole, a great tsunami (海啸), earthquakes, and the melting (融化) of tons of rock. The hit took away millions of lives around the Chicxulub Crater.
The terrible story didn’t stop there. Minutes later, hot rock started to rain down, and there was deadly dirt everywhere on the ground. More animals were burnt to death. After several hours, a super - hot wind knocked down anything still standing.
In weeks, the sky was full of ash. Days became nights. This covered the sunlight for months or even years. Many plants died first. Then lots of animals died too because of food shortage, including almost all dinosaurs.
Although this idea sounds possible, the question of how dinosaurs died out remains unsolved scientifically. But as scientists discover more dinosaur fossils, we may know the truth one day.
(A) 6. What does the underlined word it in Paragraph 2 refer to?
A. The thought that the asteroid made dinosaurs die out.
B. The fact that Chicxulub Crater is in the Gulf of Mexico.
C. The truth that all dinosaurs died out millions of years ago.
D. The idea that a rock from space made a big hole on Earth.
(A) 7. According to the scientist, what happened when the asteroid hit Earth?
A. The hit made lots of rock melt.
B. Millions of lives were lost in Mexico.
C. A big hole appeared in North America.
D. The asteroid hit Earth at 40,000 miles per second.
(C) 8. According to the idea, what was the reason for the death of almost all dinosaurs?
A. Ash and dirt. B. No sunlight. C. Food shortage. D. The asteroid’s hit.
(D) 9. Which of the following statement is TRUE?
A. Hours later, animals died because of harmful gases.
B. We will surely know the truth from dinosaur fossils.
C. The dirt after the hit didn’t hurt animals on the ground.
D. There isn’t a scientific reason for the dinosaur’s die - off.
(C) 10. Where can you probably find this passage?
A. In a storybook about dinosaurs. B. In an encyclopaedia of animals.
C. In a science book about space. D. In a travel magazine about Mexico.

答案： 6. A
7. A
8. C
9. D
10. C