单项选择题

How do dogs challenge

A．Baring their teeth.
B．Wagging their tails.
C．Standing firm with hair erect.
D．Rubbing their nose.
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单项选择题
What are the ways animals communicate
A．Words.
B．Gesture and posture.
C．Facial expressions.
D．Special signals.
单项选择题
According to the man, what shouldn't you do if you are stressed and unable to fall asleep
A．Try to sleep.
B．Get up.
C．Make a cup of camomile tea.
D．Put on a video.
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