When we see someone for the first time，we interpret many tiny things from their faces.But since the pandemic began，we have often been interacting with people whose faces we can only half see.And this goes both ways，weakening our ability to offer a friendly smile.So what does it mean to go more than a year without seeing smiles as steadily as we did before？
   A2020 research paper in the Journal of Cosmetic Dermatology（美容皮膚病學(xué)）found that dividing the face into a visible half and an invisible half might enhance the perception（感知）of negative emotions and decrease the perception of positive emotions."Emotions such as surprise that use the mouth may be mistaken for strongly negative emotions such as anger or sadness，and a smile may seem diminished or less genuine when the teeth and lips are covered，" the author wrote.
   Peter Revenaugh has been studying how people interpret faces for years.He knows this firsthand.As a surgeon who often wears masks around patients，he is careful to use other hints to be clear when，for example，he is making a joke."Some of my jokes fall flat，"he said，"because they are not really sure.They can't see me smiling."
   Ways to adjust restricted facial communication include making more of an effort to analyze positivity.People can employ a cadence（抑揚(yáng)頓挫）to their speech to guide others，for example.Crinkling the corners of the eyes，a lighter tone of the voice，all can help.Revenaugh has tried to use his eyes more to express meaning."Our eyes crinkle at the corner when we're doing a true smile，and most people around the world recognize that as a happy feeling，"he said.
   And when Revenaugh is with a patient，both masked，and he is joking？
   "I'll simply say，I'm joking."he said.

（1）What can be inferred from Paragraph Two？

D

D

A．Surprise is mainly expressed through the eyes.
B．Negative emotions always involve the mouth.
C．Half of our emotions are mistaken due to wearing masks.
D．The mouth can be very helpful in interpreting an emotion.
（2）What does the underlined word"diminished'"mean in Paragraph Two？

A

A

A．Weakened.
B．Strengthened.
C．Beautified.
D．Enhanced.
（3）What gives Revenaugh an advantage in studying the perception of emotions？

B

B

A．His personality.
B．His occupation.
C．His sense of humor.
D．His interpreting skills.
（4）How does Revenaugh make sure his jokes don't fall flat？

C

C

A．By whispering his jokes to people.
B．By making gestures with his hands.
C．By telling his intention directly to the patients.
D．By identifying his patients in a positive way.