5 Dolphins travel faster in water than any other animals.
A Right
B Wrong
C Not mentioned
6 Some scientists believe that dolphins have a language of their own.
A Right
B Wrong
C Not mentioned
7 Sounds can be called a language only when they have a structure and a grammar.
A Right
B Wrong
C Not mentioned
参考答案：1. B 2. B 3. A 4. C 5. C 6. A 7. A
