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举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】2015版《中国药典》通则指出，除另有规定外，中药材及饮片（矿物类除外）的二氧化硫残留量不得超过
A.
100mg/kg
B.
250mg/kg
C.
150mg/kg
D.
400mg/kg