(单选题)

What does the passage say about machine accuracy?

A.It falls short of researchers' expectations.

B.It improves with added computing power.

C.It varies greatly with different algorithms.

D.It decreases as the database size increases.

参考答案：D

参考解析：

细节理解题。根据第四段倒数第一句“Much better than we expected,”可知，要比科学家们预期的好很多，所以A项错误；根据第四段第一句“As the databases grew, machine accuracy dipped across the board.”可知，随着数据库的增长，机器的准确性全面下降。因此当数据库图像数量增加，它的准确性就降低，所以B项错误，D项正确；根据第三段第六句“and tested a variety of facial-recognition algorithms (算法) as they scaled up in complexity.”可知，算法随着复杂性的增大而增大，但并未提及各种算法之间有很大不同，所以C项错误。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语