阅读理解。

     Tom is a student of a primary school. He has only four lessons every day but he goes to school six

days a week. The following is his school timetable.

                                                                      Timetable

1. Tom is a          .        

A. middle school student                

B. senior school student

C.  primary school student

2. How many subjects does Tom have at the school?   

A. Five              

B. Six            

C. Seven

3. Tom doesn't go to school on _       .      

A. Tuesday          

B. Sunday        

C. Saturday

4. How many lessons does Tom have a week?         

A. Twenty          

B. Six            

C. Twenty-four

5. Which subject doesn't Tom have at school?       

A. Spanish          

B. Chinese        

C. English

心包肿瘤最重要的超声所见是：

A．在心包脏层或壁层有形状不规则的团块回声

B．心包增厚、钙化

C．心包腔内有条索状回声

D．心包有大量积液

E．心包脏层、壁层有粘连