Questions 11 to 18 are based on the conversation you have just heard.

A．They are not as dangerous as people think.
B．They can be as friendly to humans as dogs.
C．They attack human beings by nature.
D．They are really tame sea animals.

A．Most Londoners took Exercise Flood Call calmly.
B．Most Londoners were frightened.
C．Most Londoners became rather confused.
D．Most Londoners complained about the trouble caused by Exercise Flood Call.