通常，人们把社会生产的各部门划分成三类产业，下列叙述中属于第一类产业的是[ ]

John has a pet dog named Sunlight. He loves him very much. He ever told others that Sunlight was one of his family members.

One midnight, John’s house was on fire suddenly. John was sleeping and didn’t know what was happening. At that time, Sunlight noticed the fire and woke up John. John called the police. Soon the fire was put out by the police.

Now John often says to others, “ The dog is really my good friend. In the thick smoke and big fire, he could have run out of the house first, but he didn’t. No matter how dangerous it is, he first thinks of his owner.”

Today more and more dogs are wandering ( 流浪 ) in the street. Many people don’t want to keep their dogs because they move to another place. Even some people say that they can’t stand the dogs’ dirtiness. Animals are one part of our society. Maybe our pets will give us a hand like Sunlight someday.

小题1:We knew Sunlight is John’s son from the passage.

小题2:The police put out the fire that night.

小题3:Sunlight ran away because he was afraid of the fire.

小题4:Some people don’t want to keep dogs because they move to another place.

小题5:The passage mainly told us when something is on fire, you must call the police first.

RNC与NodeB的接口，叫做（）接口。

24岁初孕妇。妊娠33周，头痛6天，经检查血压160／110mmHg，治疗3天无显效。今晨5时突然出现剧烈腹痛。检查子宫板状硬。最可能的诊断是（）

A.妊娠合并急性阑尾炎

B.胎盘早剥

C.前置胎盘

D.先兆子宫破裂

E.异位妊娠

邪正斗争及其盛衰变化，决定疾病的( )。

A．虚实

B．表里

C．上下

D．内外

E．寒热

汽车等速行驶时，主要存在哪些阻力？它们各是怎样产生的？