胆汁质人具有外向、情绪兴奋性高、不灵活、可塑性小等心理特性。

Passage One

According to the man, why shouldn’t people be worried about climbing onto an elephant

A．Because elephants are mild animals.

B．Because elephants are trained to carry goods.

C．Because people have designed safe ways for the climbing.

D．Because people will be aided by professional assistants.