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補全短文：
Rough estimates in the past have predicted similarly disappointing results.________ Says Sallie Chisholm,an environmental engineer from the Massachusetts Institute of Technology."But the take-home message is the same.Ocean fertilization is not the answer to global warming."
A."These are newer and better models"
B.Its opponents argue,however,that it will stop global warming.
C.Adding iron to patches of ocean can make plankton bloom temporarily.
D.As plankton die and settle on the ocean floor,their carbon is supposedly locked up in the seabed.
正確答案：A
答案解析：這個問題可以根據(jù)引號來作答，因為空格后面有"says"這個詞，它預示著所填入的句子應該是帶引號的。A的意思是：這些是比較新的也是比較好的模型。
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