【C9】A．remain stableB．increaseC．keep changingD．decrease

A．reduceB．increaseC．produceD．consume

【C6】A．stillB．continueC．keepD．remain

The word "proliferation" in the passage is closest in meaning toA．beginningB．increaseC．occ

The operation could______her life by two or three years.（2014－68)A．prolongB．increaseC．expa

【C20】A．riseB．increaseC．trendD．presence

The operation could ____her life by two or three years.A．prolongB．increaseC．expandD．contin