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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】内底边板的结构形式有： I、下倾式；II、水平式；III、上倾式；IV、直角式；V曲折式
A.
II、III、IV、V
B.
I、II、III
C.
II、III、IV
D.
I、II、III、V