风心病二尖瓣狭窄伴有房颤者，一旦血栓脱落引起周围动脉栓塞时，其中最为常见的栓塞部位是A．肠系膜

Which of the following factors does NOT contribute to the formation of new pronunciation？

A．Back-formation.

B．Loss.

C．Addition.

D．Assimilation.

Which of the following factors does NOT contribute to the formation of new pronunciation？

A．Back-formation.

B．Loss.

C．Addition.

D．Assimilation.

Which of the following does NOT contribute to the emergence of a new class of farmers？

A．Strong desire for country life.

B．Longing for greater wealth.

C．Influence of TV productions.

D．Enthusiasm for quality food business.

A．Narrator.

B．Character.

C．Plot.

D．Rhyme.

A．Narrator

B．Character.

C．Plot.

D．Rhyme.

A．Narrator.

B．Character.

C．Plot.

D．Rhyme.

Which of the following factors does NOT contribute to happiness？

A．A well-paid job.

B．Very poor health.

C．A loving affectionate relationship.

D．A good education.

Which of the following does NOT contribute to the emergence of a new class of farmers？

A．Strong desire for country life.

B．Longing for greater wealth.

C．Influence of TV productions.

D．Enthusiasm for quality food business.

Which of the following does contribute to the idea of ageism？

A．Death is regarded as a natural part of the life cycle.

B．The old individuals are not seen as productive in their societies.

C．Modernization has decreased a continuous process of life and death.

D．Older adults receive more respect for their wisdom and experience.

Which of the following does not contribute to Toronto's healthy economy？

A．A large local market.

B．Tremendous opportunities for manufacturing and development.

C．The diversified industrial base.

D．Abundant capital.