在各种天体系统中银河系是 ①最高一级天体系统 ②与河外星系是同一级别的天体系统

Mr. Smith had two sons . One is seven years old, and the other is five. One morning during the holidays, when he was cleaning the car, his younger son came and asked him for some money for sweets.

“Sweets are bad for your teeth,” Mr. Smith said. “Take these two oranges instead(代替), and give one to your elder brother,” One of the oranges is quite a lot bigger than the other one , and as the small boy liked oranges very much, he kept that one for himself, and gave his brother the smaller one.

When the elder boy saw that his younger brother had a much larger orange than his own ,he said to him, “It’s selfish(自私的)to take the bigger one for yourself. If(如果) father had given me the oranges, I ’d have given you the bigger one. ”

“I know you would,” answered his younger brother. ” That’s why I took it. ”

根据短文内容，判断下列句子的正（T）误（F）。（5分）

小题1:Mr Smith gave his son some money for sweets.

小题2:The sweets are good for boys’teeth.

小题3:The younger boy bought some sweets for himself.

小题4:The younger boy gave the bigger orange to his brother.

小题5:The elder boy is not selfish.

* * 直肠瘘修补术应在 * * 外伤后( )

A．1周
B．6周
C．3个月
D．3～6个月
E．2～4周

按有害物质的性质，食品污染可分为______。

A．生物性污染

B．化学性污染

C．物理性污染

D．放射性污染

博美犬，4岁，1周来经常摩蹭和舔舐肛部，临诊发现肛门部肿大，肛门下方两侧破溃，流脓性分泌物，触诊敏感。根据上述症状，错误的疗法是( )。

A．烧烙疗法

B．手术治疗

C．冲洗疗法

D．缝合破溃口

E．用抗生素治疗

下列情况为应用洋地黄的适应证的是（）

A.高度房室传导阻滞，心功能Ⅳ级

B.肥厚型梗阻性心肌病，心功能Ⅱ级

C.预激综合征伴心房颤动及急性左心衰竭

D.急性心肌梗死24小时后发生室率过快的心房颤动

E.重度二尖瓣狭窄伴窦性心动过速及急性肺水肿