单选题：The word "its" in the second paragraph refers to

题目内容：

The word "its" in the second paragraph refers to A．"the nerve's".
B．"the blood's".
C．"the eye's".
D．"the retina's".

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

Paragraph 5________________.

Paragraph 5________________.A．Effects of a stroke B．Annual cost of stroke in the

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