直流电路欧姆定律是说什么？

Tony and Anna are brother and sister. They are Americans. Tony likes sports very much. He can play soccer, basketball and volleyball. Anna likes music(音乐) very much. She can't play ball games. But they both(两者都) like playing on computers.

They like eggs, bread and milk for breakfast. For lunch, Anna likes eating vegetables and fruit, but Tony likes chicken and fish(鱼). They both like hamburgers. But they don' like ice cream or dessert.

根据短文内容，选择最佳答案。(10分)

小题1:Anna is Tony’s _____ and they are _____.

A．sister; Chinese

B．sister; Americans

C．friend; Americans

D．Friends; Chinese小题2:Tony likes ______ and he can play ______.

A．sports; tennis

B．music; basketball

C．sports; volleyball

D．music; tennis小题3:Tony and Anna both like _____.

A．vegetables

B．soccer

C．playing on computers

D．music小题4:For breakfast, they like _____.

A．eggs, bread and milk

B．vegetables and fruit

C．chicken and fish

D．chicken and milk小题5:They don’t like _____ or _____.

A．ice cream; vegetables

B．ice cream; dessert

C．hamburgers; dessert

D．Fish ; ice cream

病人长期仰卧，最易发生压疮的部位是()。

A．骶尾部

B．肩峰

C．内外踝

D．膝部

E．坐骨结节

男，68岁，饮酒后不能自行排尿5小时急诊住院，体检见耻骨上包块，有轻压痛。

该患者最可能的病因是（）

A.前列腺增生

B. * * 狭窄

C.膀胱肿瘤

D. * * 结石

E.神经性膀胱

以下不属于资产配置基本步骤的是( )。

A．明确投资目标和限制因素

B．确定有效资产组合的边界

C．明确资本市场的方差值

D．寻找最佳的资产组合

泡沫灭火器扑救（）火灾效果最好。

A.油类

B.化学药品

C.可燃气体

D.电气设备