A number of them （）dangerous organic compounds which are unsafe for both human beings and the natural resources.
A.正确答案Dabsorb
B.extract
C.form
D.release
A number of them （）dangerous organic compounds which are unsafe for both human beings and the natural resources.
A number of them （）dangerous organic compounds which are unsafe for both human beings and the natural resources.
A.正确答案Dabsorb
B.extract
C.form
D.release
