The example of a bird sleeping in front of a mirror indicates that ________.
A) the phenomenon of birds dozing in pairs is widespread
B) birds prefer to sleep in pairs for the sake of security
C) even an imagined companion gives the bird a sense of security
D) a single pet bird enjoys seeing its own reflection in the mirror
. In earthquake-affected countries, light building materials are used because _____.
A. people there can move more easily
B. the houses won't hurt people in an earthquake
C. the damage will be caused in an earthquake
D. people will not be affected by the earthquake
