The twentieth century______(发生了全球性政治、经济和文化的)transfor-mation．

A．He has too many dreams.
B．He just likes to sleep.
C．He doesn’t put his ideas into practice.
D．He doesn’t have many good ideas.

A．To speed up old-fashioned breeding methods.
B．To identify all the genes in the pine tree’s genome.
C．To find out what desired traits the pine trees have.
D．To make it easier to know which gene needs altering.