《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》

B
As we all know, no creature can live forever. However, scientists have found that this is not true for a kind of jellyfish *Turritopsis dohrnii*, which is called the immortal jellyfish. It is the first creature found that has the ability to change itself back into its pre-adult form.
The babies of the immortal jellyfish are called planulae, which swim to the sea floor and grow into polyps. In this stage, the *Turritopsis* looks like a tiny branch of coral. It then releases medusae from its branches, which become adults in a few weeks. The adult medusa is only 4.5 mm long. It has a transparent (透明的) bell through which you can see its red stomach.
When it’s in danger, the medusa will transform back into a polyp. That polyp then releases more medusae, which are the same as the original adult. *Turritopsis* can still die, of course, if it is eaten or a disease strikes it.
Jellyfish don’t have brains or hearts, yet they are still genetically (从基因上) similar to humans. Because of that, research on the *Turritopsis*’ process of regeneration may be useful for the fields of cancer research. The transformation from an adult medusa back into a polyp is called “transdifferentiation”. Through this process, an adult cell can become another kind of cell. This kind of cell may replace human cells damaged by disease.
4. The underlined word “immortal” in the first paragraph can be replaced by “______”.
A. beautiful
B. deadly
C. changing
D. lasting
D
5. The first form of an immortal jellyfish is ______.
A. the planula
B. the polyp
C. the medusa
D. the *Turritopsis*
A
6. Which of the following statements is true according to the passage?
A. The medusa is the adult form of an immortal jellyfish.
B. The immortal jellyfish will never die.
C. In the stage of the planula, the jellyfish can produce medusae from its branches.
D. The stomach of an adult jellyfish can be seen from outside.
D
7. Where may this passage come from?
A. A personal diary.
B. A research paper.
C. A science magazine.
D. A storybook.
C

答案： 4. D 词义猜测题。由上下文可知，immortal 在这里意思最接近 lasting（持久的），因此选 D。
5. A 细节理解题。由第二段 The babies of the immortal jellyfish are called planulae... 可知，应选 A。
6. D 细节理解题。由第二段最后一句可知，应选 D。
7. C 推理判断题。本文主要介绍了一种可以永生的水母。由文章的内容和使用的词语可推测，应选自科学类杂志，因此选 C。