Which of the following statements about currency risk is most accurate Generally:（）

A. if the home currency appreciates against the foreign currency, each foreign currency unit will be worth more in terms of the home currency.

B. appreciation of the foreign currency is good for domestic investors who buy foreign securities.

C. if the foreign currency appreciates, the foreign cash flow will be worth less for the domestic investor.

人在社会中扮演多种角色，其行为应随时间环境不同进行调整，这是（）

A.角色等待

B.角色转换

C.角色冲突

D.角色矛盾

E.角色缺如