Perfectionist applicants who have a strong need to do well and a high expectation of themselves are more likely to suffer excessive nervousness in an interview.

A．higher productlvity, but a lower average income
B．lower productivity, but a higher average income
C．lower productivity and a lower average income
D．higher productivity and a higher average income

A．there are too many underdeveloped countries in the world
B．underdeveloped countries have low level of industrial development
C．different governments have different views of the question
D．even developed countries have complex problems