Question 22 is based on the passage you have just heard. 

听力原文

        Communication can essentially be divided into two categories: the written and the spoken. How the balance is struck between these two forms of communication—the point at which one needs to be exchanged for another—really depends on individual cultures. (22) [Understanding when it’s appropriate to exchange one form for another can be a major key to success in international business.] Many cultures place a much greater value on the spoken word than the American working culture does. (23) [In parts of the Middle East, you’ll find spoken word agreements are seen as seriously binding.] A person’s word is linked to their honor, so verbal agreements are seen as important, whereas written contracts are taken as memos of understanding. (24) [Western working culture tends to place a high value on the written word, and this reaches its highest level of intensity when it comes to contracts.] In the US, France and Germany, written contracts tend to be seen as something that must be strictly carried out. By contrast, other cultures may not see written contrasts as quite so binding. It can prove a challenge to Western businesses if your business partner wants to renegotiate terms that you thought were already agreed on. For example, (25) [a Japanese firm may have signed a contract, but they may not feel bound by every detail of it]—particularly if circumstances later change. Such differences in value that different working cultures place on the written word tend to cause many problems when it comes to business relationships.

22. What is a major key to success in international business according to the passage?

解析：D。录音前半部分提到，懂得何时适合从一种沟通方式转换到另一种沟通方式（Understanding when it’s appropriate to exchange one form for another）是在国际贸易中取得成功的关键，D项与此相符，其中的appropriately对应录音中的appropriate，故为正确答案。

错项排除：A项利用录音中的signed、business和contract设置干扰，但录音中并未提到签订合同的最佳时机，故A项排除。录音中提到要适时（when it’s appropriate）转换沟通方式，但并不是说要不时（from time to time）更换，B项曲解原意，故错误。录音中提到了书面沟通和口头沟通这两种沟通方式，但Laying equal stress在录音中无依据，故C项排除。