Before a child can learn a musical instrument he or she first needs to acquire the necessary ______ skills.

A．most immigrants are either highly skilled or poorly unskilled
B．immigrants are mostly those who received little education before arrival
C．immigrants take up a larger proportion of American population than thc natives
D．there are more highly skilled immigrants in America than unskilled immigrants

A．introduce green cards of their own countries
B．introduce skilled immigrants proportionately
C．create more jobs for the unskilled immigrants
D．try to admit and attract highly-skilled immigrants