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S1: Plastic containers are being used more and more to package soft drinks, milk, oil, fruit juices, ketchup, etc.P: Most people think that this is the right thing to do, as it is economical.Q: Plastic containers are cheap and light.R: It is easier to transport materials packaged in them than in glass bottles.S: They also involve the least transport costs.S6: Yet as plastics do not decompose by bacteria or naturally in the air, they are a big threat to the environment.The Proper sequence should be:

A. QRS
B. QSR
C. RSP
D. SPR
Answer» C. RSP


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