下图既可以看成正在对视的两个人，也可以看成一个酒杯。这表明 [ ] A．运动是客

按课文填空。根据课文内容填入适当的单词，完成短文。（10分）

It’s also probably a good idea for parents to  _76 teenagers to study in groups  77 the evening. I know we get  78 sometimes, but we  79 a lot from each other. We also think that vacations should be   80 . At present they’re too short. Longer vacations would give us time to do things  81  volunteering. Last summer I had an  82 to volunteer at the local hospital, but I couldn’t because I had to  _84 back to school. It would be a good  _84 for me because I want to be a doctor when I’m  85  .

植物的根、茎、叶是营养器官。植物依靠营养器官进行无性生殖，叫做            。其常用的方法有              、                、              。

男，45岁，腰骶部疼痛2年。CT示骶骨破坏伴软组织肿块及斑片样钙化，强化后扫描软组织部分有增强，最可能的诊断是（）

A.巨细胞瘤

B.肉瘤

C.转移瘤

D.包囊虫

E.脊索瘤

下列哪个是Java程序和数据库连接的一种机制

A． -3 3

B．5 -9

C． 3 -3

D．-6 5

扇形溜槽适合处理什么类型矿石？