試題詳解

36. Olive: What’s the biggest source of pollution? You might be surprised at the answer.
Penny: Plastic bags?
Olive: No, disposable diapers.
Penny: But how come they became a source of pollution?
Olive: ____________
(A) About forty years ago.
(B) They don’t break down easily.
(C) Cotton diapers are good for the environment.
(D) People are using fewer disposable diapers.