Jaak Panksepps study on a mouse proves that the seeking driveA．originates in the limbic sy

Which of the following terms is equivalent to what Freud called libido?

A．Emotion.

B．Lust.

C．Seeking.

D．Urge.

Freud believed that aggression and libido

A．were the only two sources of psychic energy.

B．could sometimes surface in our conscious life.

C．affected our behaviour unconsciously.

D．could appear clearly in our dreams.

What can we learn about the feature of the robot-roaches?

A．They look much like the real roaches.

B．The programming of them will never be overridden by the real roaches.

C．They can behave like the biological cockroaches.

D．They can emit the same molecules that roaches use to identify their kin.

What did the real cockroaches do when the robot-roaches made an inappropriate decision?

A．Some of them headed toward the dark areas.

B．Many followed the collective to a lighter shelter.

C．All of them followed the collective to a lighter shelter.

D．Most of them stayed still.

What does the word "emit"(Line 4, Paragraph 2)probably mean?

A．give out

B．turn out

C．figure out

D．set out

The aim of the experiment carried out in Belgium is

A．to make the robots cousins with the biological roaches.

B．to get the robotic and biological roaches to cooperate on common task.

C．to figure out how individual"s behavior. leads to a collective decision.

D．to make the robots look and smell like the real ones.

What is the passage mainly about?

A．The relationship between bees" individual motion and the hive"s overall success.

B．The process of a scientific experiment about the robot-roaches and the real ones.

C．How millions of brain cells give rise to thoughts.

D．How to invent a robot that human beings would accept.

The passage is mainly about

A．the substitutes for self-healing composites.

B．the differences between animals and machines.

C．different ways of realizing self-recovery.

D．materials capable of repairing themselves under development.

Both Dr. Moore and Dr. Bonds researches aim to

A．add a new extra ingredient to the machines.

B．make the future machines longer and healthier lives.

C．find a way of checking that an ingredient has really healed.

D．make up for the healing molecules once some of them have been used.

Which of the following is true about Ian Bonds method?

A．The capsules he uses are more difficult to make than hollow fibres.

B．He uses carbon fibres rather than glass fibres in his composite materials.

C．He has added capsules into the fibres themselves instead of the healing molecules.

D．A crack in the material breaks the fibres to release the ingredients to fix the crack.