用一根拉紧了的线绳来表示“直线”，这种概念的表示法是( )。A．规定外延的方式B．

被灭活的病毒不能保留的特性是

A．抗原性

B．红细胞吸附性

C．感染性

D．血凝性

E．细胞融合

体内CO2分压最高的部位是

A．静脉血液

B．毛细血管血液

C．动脉血液

D．组织液

E．细胞内液

用所给动词的适当形式填空。

1  He _____ (wash) the dishes in the kitchen when I saw him yesterday evening.

2. Some old people are happy _____ (be) with the young ones.

3. Tom says he _____ (not watch) the video film tonight.

4. How _____ Bob _____  (go) to school every day except weekends?

5. "Mun, I saw a new kind of bike. It _____ (cost) only two hundred and fifty yuan,"  "Oh, really?"

6. Can she _____ (run) as fast as Helen ?

7. We_____ (visit) the Great Wall next week.

8. Don't _____ (talk) now.

9. Let's_____ (try) our best _____ (finish) the work in an hour.

登轮许可证（临时）仅限本港口使用，有效期最长（）？

A.六个月

B.三个月

C.三十天

D.七天

(5)将“员工年龄情况图”插入到表的A9：C19单元格区域内。