《2025年英语同步练习与测评高中英语必修1外研版青海专版》

<题目>B
In 1992 workers were building a highway in southern California when they discovered the bones of a mastodon (an elephant - like animal). Archaeologists (考古学家) started to examine the site and they found sharply broken rocks with the bones. The rocks looked like a human might have used them as hammers to break the bones to make bone tools. The bones were found in two piles, which was not the way the bones would be laid out if the animal died naturally on the spot.
At the time the site was discovered, there wasn’t a good way to date the bones. However, finally scientists were able to date them using new technology. What they found was shocking – the bones are around 130,000 years old. Most scientists agree that humans first came to the Americas across the Bering Strait between 13,000 and 15,000 years ago. The date of the mastodon bones would mean that humans arrived in the Americas almost ten times earlier than that.
Of course, some archaeologists think that humans may not have broken the mastodon bones. It is possible that the bones were broken by nature – in a landslide. Also, critics want the bones to be dated using other technology to confirm the 130,000 date.
Although there is no clear answer yet, if this is the evidence of humans from 130,000 years ago, it will change everything we thought we knew about humans arriving in the Americas.
5. The bones may prove the existence of humans in the Americas because _.
A. they were broken by humans
B. they were divided into two piles
C. they were discovered by humans
D. they were from an ancient animal living in the Americas
6. What does the underlined word “mudslide” in paragraph 3 refer to?
A. A place.
B. A fight.
C. A natural disaster.
D. Bad weather.
7. According to the passage, which of the following statements is true?
A. The bones were between 13,000 and 15,000 years ago.
B. The mastodon died naturally instead of being killed for its meat.
C. Scientists were able to date the bones when they discovered them.
D. The discovery may change our knowledge about humans arriving in the Americas.
5. (B)
6. (C)
7. (D)

答案： 5. B 细节理解题。由第一段可知，这些骨头被分成两堆，与动物自然死亡的骨骼排列方式不同，由此猜测可能有人类活动。6. C 词义猜测题。由上下文可推知 mudslide 为一种自然灾害。7. D 细节理解题。由最后一段可知，如果此发现被证实，那么美洲出现人类迁徙的历史将被改写。