若代数式(1-a)2+(3-a)2的值是常数2，则a的取值范围是______．

A farmer had a cow. He took very good care of this cow and one day when it was ill, he was very worried. He telephoned the vet.　“What’s the problem?” The vet asked him when he arrived.

　　“My cow's ill,” the farmer said. “I don’t know what's the matter with her. She’s lying down and won’t eat. She's making a strange noise.”

　　The vet looked over the cow. "She's certainly ill," he said, "and she needs to take some very strong medicine."

He took a bottle out of his box, put two pills into his hand and said, "Give her these. The pills should make her better."

　 “How should I give them to her?” the farmer asked.

　　The vet gave him a tube (管子)and said, "Put this tube in her mouth, then put the pills in the tube and blow. That'll make it."

　　The next day the vet came to the farm again. The farmer was sitting outside his house and looked more worried.

　　“How's your cow?” the vet asked.

　　“No change,” the farmer said, “and I’m feeling very strange myself.”

　　“Oh?” the vet said, "Why?"

　　“I did what you said,” the farmer answered. “I put the tube in the cow's mouth and then put two pills down it.”

　　“And?” the vet asked.

　　“The cow blew first,” the farmer said.

小题1:In the story, the vet must be _________.

A．the farmer's friend

B．a milk factory

C．a hospital for cows

D．a doctor for animals小题2:The farmer asked the vet for help when his cow _______

A．couldn't lie down

B．didn't eat the pills

C．couldn't make any noise

D．was ill小题3:What medicine did the vet give the farmer?

A．Bottle of pills.

B．A long tube.

C．Two pills.

D．A small box.小题4:The vet taught the farmer how _________.

A．to blow the tube

B．to make the cow take the pills

C．to take the medicine

D．to put the tube in his mouth小题5:Which of the following is true?

A．The farmer ate the pills himself.

B．The cow got better after taking the medicine.

C．The vet came to help farmer change the cow the next day.

D．The farmer waited for the vet outside his house the next day.

当代电子信息技术的基础有两项：一项是微电子与光纤技术；另一项（）技术，电子计算机从一开始就采用了该技术。

雨水管

什么是附赠？

关于“罪过”，下列哪些说法正确（）

A．故意和过失都是罪过形式之一

B．意外事件是罪过形式之一

C．不可抗力是罪过形式之一

D．意外事件造成损害结果的，不是犯罪，这是罪过责任原则的体现．