( ) 1. What can we infer from the fact that dolphins can learn complex tricks quickly?
A. They have a short memory span. B. They are highly intelligent.
C. They only learn tricks in aquariums. D. They copy what humans do.
( ) 2. The story about the dolphins saving the little boy shows that dolphins are .
A. good at fishing B. fast swimmers
C. kind and helpful D. always near boats
( ) 3. Why do dolphins make clicks and whistles?
A. Just for lots of fun. B. for communication and guidance.
C. To attract humans. D. To tell the time.
( ) 4. What is the main reason dolphins are in trouble?
A. They are too friendly and get close to humans.
B. They are caught in fishing nets and harmed by ocean pollution.
C. They can't find enough food because of other animals.
D. They are not good at protecting themselves.
( ) 5. What's the writer's purpose in writing this article?
A. To introduce the living habits of dolphins.
B. To tell people interesting stories about dolphins.
C. To call on people to protect dolphins.
D. To describe the appearance of dolphins.

1. B.