expressions of people that are the serene gender as their owner.
29.How did the scientists conduct the experiment?
A.By leaving dogs to women who.are either happy or angry.
B.By mixing the selected dogs together.
C.By rewarding only half of the dogs touching the screen.
D.By showing digital pictures of women's happy or angry faces.
30.Which of the following statements is TRUE?
A.The dogs were not all provided with the entire face,
B.According to their size, the dogs were given either upper or lower halves.
C.The dogs.could read even small changes that accountancy facial expressions after some training.
D.The dogs couldn't read strangers facial emotions.
31.The underlined word "trepidation" in Paragraph 5 probably means .
A.horror B.curiosity C.excitement D.doubt
32.How might the results change if the dogs with female owners are shown pictures of male faces?
A.They could only tell commotions on partial faces rather than on entire face's.
B.They found it hard to tell the moods on the faces of a different gender.
C.They found it easy to tell the emotions on the entire -face.
D.They would be scared away at the sight of the pictures.
D