目前控制结核病流行最有效的措施是A．给未感染者接种卡介苗B．给

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问题单项选择题

目前控制结核病流行最有效的措施是

A．给未感染者接种卡介苗
B．给感染者服用抗结核药物预防发病
C．发现并治愈传染性肺结核病人
D．对污染的空气进行消毒
E．病人的碗、筷与健康人分开

答案

参考答案：C

解析：控制结核病的首要策略是病人的发现和对传染性患者的治愈(起到减少传染源的作用)。卡介苗能保护从未感染过结核的新生儿或幼儿免于重症结核病，但对成年人结核发生预防效果不明显。

完形填空

A farmer had some little dogs to sell. As he was putting up an advertisement on the fence of his yard, a __1__ happened to pass by.
“I want to __2__ one of your dogs, sir.”
“Well,” said the farmer, “these dogs come from fine parents and cost a lot of __3__.”
The boy __4__ his head for a moment. Then he reached deep into his __5__ and pulled out some change. “I’ve got thirty-nine cents(美分). Is that __6__ to take a look? ”
“__7__,”said the farmer. And with that he let out a whistle(口哨),“Here, Dolly!”
Dolly ran out of the doghouse ___8___ by four little dogs. The boy’s eyes danced with joy.
As the dogs made their way to the fence, the little boy noticed something else moving inside the __9__.Slowly another little dog __10__; this one much smaller. It was doing its best to __11__...
“I want that one,” the little boy said.
The farmer said, “Son, don’t want that dog. He will __12__ be able to run and play with you like the other dogs would.”
The boy rolled up(卷起) one leg of his pants and showed a steel(钢) __13__.Looking back up at the farmer, he said, “You see, sir ,I don’t __14__ too well myself ,and he will need someone who __15__.”

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空间有一均匀强电场，在电场中建立如图所示的直角坐标系O-xyz，M、N、P为电场中的三个点，M点的坐标(0,a,0)，N点的坐标为(a,0,0)，P点的坐标为。已知电场方向平行于直线MN，M点电势为0，N点电势为1V，则P点的电势为

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