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Is that person really glad to see me? Or is he just being polite? Some people struggle to distinguish a fake smile from a truly happy smile. And computers have found this task even more difficult—that is, until researchers trained a program to examine when a smile is genuine.

Visual computing researchers at the University of Bradford in the U.K. started with software for analyzing a changing facial expression. This program can examine a video clip of a human head and identify specific details around the eyes, cheeks and mouth. Then the program tracks the details moving relative to each other as the face smiles.

Next, the scientists had their program evaluate two sets of video clips. In one, subjects performed posed smiles. In the other, they watched a film that inspired genuine displays of emotion. The program calculated the differences among the subjects' faces during the two clips. And it turns out that your mouth, cheeks and eyes move differently when you're faking that smile.

In particular, the muscles around the eyes shift 10 percent more for a real smile than they do for a fake one. These results are in the journal Advanced Engineering Informatics.

The researchers suggest their work could improve a computer's ability to analyze facial expressions and thus to interact more smoothly with humans. But their real accomplishment is in proving Tyra Banks right: "You have to smile with your eyes."

1.What can we know from Paragraph 1?

A Researchers can find when a smile is genuine.

B People are easy to tell whether a smile is genuine.

C Computers are hard to tell when a smile is genuine after being trained.

D A program can detect when a smile is genuine after being trained.

解析：选D。细节理解题。根据文章第二段最后一句until researchers trained a program to examine when a smile is genuine.可知研究人员可以训练程序来检测微笑何时是发自内心的，故选D。

2.What do the researchers begin with the software?

A To analyze a changing facial expression.

B To examine a video clip of a human head.

C To identify specific details around the eyes.

D To track the details moving relative to each other.

解析：选A。细节理解题。根据文章第二段第一句Visual computing researchers at the University of Bradford in the U.K. started with software for analyzing a changing facial expression.可知视觉研究人员用软件来分析面部表情变化，故选A。

3.What’s the difference between a real smile and a fake one?

A Your muscles move the same when you’re faking that smile.

B The muscles around the eyes shift 10 percent more for a real smile.

C The muscles around the mouth shift 10 percent more for a fake smile.

D Your body language moves differently when you’re faking that smile.

解析：选B。细节理解题。根据文章第四段第一句In particular, the muscles around the eyes shift 10 percent more for a real smile than they do for a fake one.可知眼睛周围的肌肉，真笑时会比假笑时多移动10%，故选B。

4.What does the result imply?

A To smile with your eyes.

B To tell a fake smile from a truly happy smile.

C To improve a computer’s ability to analyze facial expressions.

D To make a computer interact more smoothly with humans.

解析：选A。推理判断题。根据文章最后一段最后一句But their real accomplishment is in proving Tyra Banks right: “You have to smile with your eyes.”我们可以得出结论：让你用眼睛来微笑，故选A。