In the sentence "To do this, we need to persuade mankind." (Par

A．war is the only way to solve international disputes
B．war will be less dangerous because of the improvement of weapons
C．it is impossible for people to live without war
D．war must be abolished if man wants to survive

A．are capable of reliably recognizing the shape of an object
B．are close to exhibiting humanlike behavior
C．are not very different in their performance from those of the 50's
D．still cannot communicate with people in a human language