早期食管癌X线分期标准是()A．病灶局限于粘膜和粘膜下层 B．病灶小于2cm C．仅

阅读理解。

     David is eight. One day his friend Rose says to him, "This Sunday is my birthday. Can you come to my

  birthday party?" David says, "Yes".

     On Sunday, David asks his mother if he can go to the party. His mother says, "Yes, you can go, but

  you must be polite. Don't ask for any food. They will give you some." "All right, Mum." David answers

 and he goes to Rose's house on his bike.

     There are lots of kids at the party. They play together for some time, and then Rose's mother gives

 them some food, but she forgets David. He waits and waits and then he takes his plate up and asks, "Do

  you want a nice clean plate?"

1. Whose birthday is it? _____.

    A. Rose's          

    B. David's        

    C. Rose's mother's  

    D. David's mother's

2. The birthday party is in _____.

    A. Rose's house    

    B. David's house    

    C. Rose's school    

    D. David's school

3. David goes to the party _____.

    A. by car          

    B. by bike          

    C. by bus          

    D. on foot

4. David is Rose's _____.

    A. mother          

    B. classmate        

    C. brother          

    D. friend

5. Who gives David food at the party?

    A. Rose          

    B. Rose's mother    

    C. the kids        

    D. No one      

计算机病毒对于操作计算机的人

A．只会感染，不会致病

B．会感染致病，但无严重危害

C．不会感染

D．产生的作用尚不清楚

男性，65岁，高血压心脏病、心功能不全，心电图示高度房室传导阻滞，两肺底闻及湿啰音，此时不宜选择下列哪种降压药物（）

A.卡托普利

B.依那普利

C.β受体阻滞药

D.噻嗪类利尿药

E.哌唑嗪

遵守时间是高尔夫的重要原则

简述系统测试的原则。