用所给单词的适当形式填空  

1. Can you give me your _________(explain) for your absence?  

2. During the Spring holidays there are many _______ (culture)activities.  

3. In America, we often greet people by ________(shake) hands or hugging. 

4. I'll call you as soon as I ________(get to) New York.  

5. Could you tell me some special customs that ________(not find) in Chinese culture?

在孕妇腹壁上听诊，下列音响与母体心率一致的是：（）

A.胎心音

B.子宫杂音

C.脐带杂音

D.胎动音

E.肠蠕动音