The waste can be recycled into new products, which will save natural resources.
A. in turn
B. in return
C. in order
D. in time
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(答案→)A. in turn
B. in return
C. in order
D. in time
解析：短语辨析。A.轮流，依次 B. 作为报答C.整齐 D.及时。句意：废品可以回收利用成新产品，这样（轮流）可以节省自然资源。故选A。