Why we need to protect polar bears 5

A wildpolar bear worked out a method of reaching a platform wherea　   11

　was located.

（ in wild polar bears,although not as obviously as with GoGo. A calculated move by a male bearinvolved running and jumping onto barrels in an attempt to get to aphotographer standing on a platform four metres high.）   photographer

Polar bears have displayed behavioursuch as conscious manipulation of objects andactivity similar to a　

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. （ bearsputting objects in piles and then knocking them over in what appeared to be a game. ）  game

Bears may also display emotions. For example:　

They may make movements suggesting　

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　if disappointed whenhunting.

They may form relationships with otherspecies.

frustrate /frʌˈstreɪt/  vt.使沮丧   frustr  欺骗

frustration  [frʌˈstreɪʃn]   沮丧

（ many bears have beenseen to hit out at ice and snow -seemingly out of frustration - when they havejust missed out on a kill.）    frustration