Why did researchers create MegaFace?
A. To enlarge the volume of the facial-recognition database.
B. To increase the variety of facial-recognition software.
C. To understand computers’ problems with facial recognition.
D. To reduce the complexity of facial-recognition algorithms.
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What does the passage say about machine accuracy?
A. It falls short of researchers’ expectation.
B. It improves with added computing power.
C. It varies greatly with different algorithms.
D. It decreases as the database size increases.
What is said to be a shortcoming of facial-recognition machines?
A. They cannot easily tell apart people with near-identical appearances.
B. They have difficulty identifying changes in facial expressions.
C. They are not sensitive to minute changes in people’s mood.
D. They have problems distinguishing people of the same age.
What is the difficulty confronting researchers of facial-recognition machines?
A. No computer is yet able to handle huge datasets of human faces.
B. There do not exist public databases with sufficient face samples.
C. There are no appropriate algorithms to process the face samples.
D. They have trouble converting face datasets into the right format.
以下事件中,哪些属于慢性应激源?
A. 严重的车祸
B. 天津港口爆炸
C. 职位晋升
D. 失恋
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