(单选题)

What has been found by the researchers? ( )

A.A HIV-fighting protein.

B.An HIV vaccine.

C.A genetically modified pill.

D.A herb cream.

参考答案：A

参考解析：

根据原文中第一段中A new study reports a new genetically-modified rice produces proteins that attach directly to the HIV virus and can prevent the virus from mixing with human cells by neutralizing the virus and blocking its transmission.可知一项新的研究报告表明一种新的转基因水稻产生的蛋白质能直接附着在艾滋病病毒上，并能通过中和病毒和阻断病毒传播来防止病毒与人体细胞混合。所以研究者们已经发现的是一种抗艾滋病病毒的蛋白质。选项A：一种抗艾滋病病毒的蛋白质；选项B：艾滋病疫苗；选项C：转基因药丸；选项D：药膏。故本题正确答案选A。

知识点：细节题英语阅读理解通用英语