Many nations have promised to reduce greenhouse gas emissions, but are falling short of the reduction of 25 to 40 percent of 1990 levels.
A. target
B. option
C. profit
D. refund
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(答案→)A. target
B. option
C. profit
D. refund
解析：考查名词词义辨析。A目标；B选择；C利润；D偿还资金，偿还数额；句意：很多国家都允诺减少温室气体的排放，但是排放的目标下降了百分之25到40.根据句意说明A正确。