Different gestures （手勢(shì)） mean different things in different countries. Sometimes a gesture that is polite in one country is not polite in another and should not be used. 1 . A gesture that many people do not understand is one that uses the thumb. Most westerners will sometimes show that they like something by holding out a closed hand with the thumb lifting in the air. This is called give someone or something “the thumb up”. Often， only one thumb is used， so it should be “the thumb up”.

The usual explanation （解釋） for the origin of this gesture is not really correct. It says that in ancient Roman times， when people were pleased with the way a gladiator（角斗士）had fought，

2 When they were not pleased， they gave the thumbs down. When a gladiator was given the thumbs up， the emperor allowed him to live. 3 ， the emperor ordered him to be killed.

The truth is， however， it was translated into a wrong meaning by mistake. If people wanted to save the gladiator， 4 . If they wanted the gladiator to die， they pointed their thumbs straight at him.

閱讀上面短文，把A-D四個(gè)句子填入文中空缺處，使短文內(nèi)容完整、正確。

A. When a gladiator was given the thumbs down

B. they put out their hands and hid their thumbs in their hands

C. Different meanings of gestures can also cause problems in understanding what another person is trying to say

D. They showed their thumbs up