答案:B
解析:
The correct choice is (B). The singular possessive pronoun "its" does not agree with the plural noun it refers to, "Scientists," and should be replaced with the plural possessive pronoun "their."
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答案:B
解析:
The correct choice is (B). The singular possessive pronoun "its" does not agree with the plural noun it refers to, "Scientists," and should be replaced with the plural possessive pronoun "their."