肺动脉瓣区第二心音亢进提示（）。
A.肺动脉瓣关闭不全
B.肺动脉高压
C.心包积液
D.右心房肥大
E.左心房肥大
参考答案：B
用所给词的适当形式填空。
1. Tom (have) to have a meeting yesterday.
2. When did your mother (leave) for Dalian?
3. Mike needs (eat) lunch at school.
4. Could you please (take) the desk away?
5. He likes (cook) very much.
档案编研工作是一项具有鲜明的政治性和较强的研究性的（）。
A、科研性工作
B、条件性工作
C、基础性工作
D、学术性工作
