Pls solve my gap filling Captive animals are often kept in poor (a)
inhuman conditions. In the worst zoos, animals
. the entertainment
are still displayed (b) .
_ animals are placed
ofthe public. (c) .
in impoverished and unsuitable surroundings,
— often behave in abnormal and neurotic
ways. It is common for polar bears (e) .
constantly pace up and down or twist their heads
and circle over and over again. This behaviour is
a sign
now recognized by scientists (f)
ofstress and frustration.
