未知题型 Though she began her by singing in a local pop group, she is now a famous Hollywood movie star.　　A) profession B) employment C) occupation D) career

未知题型 Only those who can to lose their money should make high-riskinvestments.　　A) afford B) endure C) sustain D) maintain

未知题型 Science and technology have ___ in important ways to the improvement of agricultural production.A) attached B) assisted C) contributed D) witnessed