烹饪示范教学要做好（）上的准备。A、理论和实践 B、原料和调料 C、思想和技术 D、

某母线段与段进行封闭连接时，两段母线的外壳未对准，使母线及外壳受到机械应力而变形。
为避免母线及外壳变形，应采取哪些防护措施

阅读理解。

     Ken is nine this year. He's in Grade Three. His father is a driver in a factory and his mother works

in a hospital. His sister Kate is six.

     It's Saturday afternoon. Ken is sitting in the room and reading a book. Kate comes to the room

and says, "Ken! Mum wants you to help her."

     "What does she want me to do?" asks Ken. " To wash the apples or cut the cakes?"

     "Neither (两者都不)." answers Kate. "She is washing clothes in the garden. She wants you to

carry (运送) water for her."

     "Why don't you do that?"

     "Mum says I'm too young."

     "Don't you see I'm busy (忙的)?"

     "What are you doing here?"

     "I'm reading a book. I can't go there."

     "Is it an interesting book?"

     "Yes, it is."

     "Well, let me help you read the book and you can go to help Mum." says Kate.

1. Ken's mum is a ________.

A. teacher  

B. doctor

C. worker  

D. manager

2. What is Ken doing in the room?

A. He is reading a book.

B. He is doing his homework.

C. He is cleaning the room.

D. He is watching TV.

3. Kate comes to the room and asks Ken ________.

A. to read the book.  

B. to clean the room  

C. to wash the apples

D. to help their mum

用煤来发电（火电站）与水力发电（水电站）的主要不同是[ ]

A．火电站建设周期短，运转时投资少

B．火电站污染空气，水电站不会破坏生态环境

C．水电站综合效益高，运转成本低

D．水电站建设周期短，投资少

1岁小儿，不会站立，表情呆板，很少哭，智力低下，尿有霉臭，皮肤白皙，毛发黄褐色，腹反射亢进，三氯化铁试验（），该患儿的治疗主要给予：

A.补充蛋白质

B.补充大量

C.无特殊治疗方法

D.低苯丙氨酸饮食

E.补充多种氨基酸