5. One thing that suggests that octopuses are intelligent is that...

Решение:

Выбираем вариант, который указывает на признак интеллекта у осьминогов.

1. a) they were smarter than computers.
2. b) they learn how to do complicated tasks.
3. c) they can easily change their colour and body pattern.
4. d) their brains are similar to cats'.

Ответ: b