1. The main idea of the text is ___.
- A
A. dolphins can recognize themselves in a mirror
- B
B. two scientists did a lot of experiments to test the intelligence of dolphins
- C
C. dolphins can help a lot in the research of brain development
- D
D. dolphins are one of the smartest animals in the world
2. The phrase “special skill” in the first paragraph refers to ___.
- A
A. dolphins can swim freely in the sea
- B
B. dolphins can find themselves in a mirror
- C
C. dolphins can eat a mirror
- D
D. dolphins can recognize themselves in a mirror
3. We can find the level of self-knowledge in ___.
- A
A. human being
- B
B. apes
- C
C. human being and apes
- D
D. animals
4. The dolphins repeatedly swam to ___.
- A
A. check the place marked with ink
- B
B. mark the place with ink
- C
C. see whether there is a mark
- D
D. find out the place with ink
5. Most animals will refuse to look at a mirror or have a strong reaction because ___.
- A
A. they think they are not beautiful in the mirror
- B
B. they think there is another animal in the mirror
- C
C. they think the animals in the mirror are too strong to be beaten
- D
D. they think the animals in the mirror want to kill them