A.The only approach to building an artificially intelligent computer.
B.The only way for them to win a prize in artificial intelligence research.
C.The only area worth studying in computer science.
D.The only game they would like to play in town.
A.A lack of mates.
B.A fierce competition.
C.A lower survival rate.
D.A defective gene.
A.Wealthy people tend to have fewer children than poor people.
B.Natural selection hardly works among the rich and the poor.
C.The middle class population is 80%smaller than that of the tribes.
D.India is one of the countries with a very high birth rate.
A.life has been improved by technological advance
B.the number of female babies has been declining
C.our species has reached the highest stage of evolution
D.me difference between wealth and poverty is disappearing