.People in different countries greet each other in different ways. In some western countries, people sometimes give a kiss on the cheek (脸颊) or a hug to their friends.In sometheir friends.In some Asian countries,they usually bow slightly to greet each other. From this passage, we can learn about ____D________. A: how to greet people in China. B: different countries have different languages. C: people greet each other in the same way. D: different ways of greeting.