蛋白质主要由碳、氢、氧、（）四种元素构成，另外还有少量的硫、磷、铁、碘等元素。A、锌

威胁美国大陆的飓风是由非洲西海岸高气压的触发形成的。每当在撒哈拉沙漠以南的地区有大量的降雨之后，美国大陆就会受到特别频繁的飓风袭击。所以，大量的降雨一定是提升气流的压力而构成飓风的原因。
以下哪项论证所包含的缺陷与上述论证中的最相似

A．汽车在长的街道上比在短的街道上开得更快，所以，长街道上的行人比短街道上的行人更危险。

B．许多后来成为企业家的人，他们在上大学时经常参加竞争性的体育运动。所以，参加竞争性体育运动一定能促进使人成为企业家的能力。

C．桑菊的花瓣在正午时会合拢，所以，桑菊的花瓣在夜间一定会张开。

D．东欧的事件会影响中美洲的政治局势，所以，东欧的自由化会导致中美洲的自由化。

病历摘要：男性，10岁，自幼发现心脏杂音，无发绀蹲踞等病史。体检：发育较差，胸骨左缘第三肋间扪及震颤，可闻及Ⅳ级全收缩期杂音，P2增强。心脏三维片示双肺充血，左房左室大。

决定行手术治疗，你认为影响手术的主要因素为：（）

A.缺损大小

B.病人年龄

C.心功能

D.肺动脉压力

E.肺血管阻力

与青少年牙周炎最为密切的致病菌为（）

A.牙龈卟啉单胞菌

B.黏性放线菌

C.伴放线放线杆菌

D.梭状杆菌和螺旋体

E.中间普氏菌

阅读理解。

     Jim, a successful businessman, told the experience of his childhood.

     When he was 12, his parents died. He was alone and didn't get on well with others. People always laughed

at him. No one showed kindness to him. 

     His only friend was a dog named Tiger. He gave his dog enough to eat and drink, but sometimes he was

not polite to it. He didn't know that an unkind word sometimes could cut one's heart like a knife.

     One day as he walked down the street, a young lady was walking in front of him. Suddenly one of her bags

dropped from her arms. As she stopped to pick it up, she dropped other bags. He came to help her. "Thank

you, dear! You are a nice little boy!" she said kindly, smiling.

     A special feeling came to him. These were the first kind words he had ever heard. He watched her until

she went far away, and then he whistled (吹口哨) to his dog and went directly to the river nearby.

     "Thank you, dear! You are a nice little boy!" he repeated (重复) the woman's words. Then in a low voice

he said them to his dog! Tiger raised its ears as if it understood.

     "Unum! Even a dog likes it!" he said, "Well, Tiger, I won't say unkind words to you any more." Tiger

waved its tail happily.

     The boy thought and thought. Finally he looked at himself in the river. He saw a clean nice boy. He was

amazed (惊奇). From then on, he had a new life.

     After telling this, the businessman stopped for a while, and then he said, "Ladies and gentlemen, this is the

very place where that kind woman planted in me the first seed (种子) of kindness. All of us should learn about

kindness. What a great power (力量) it has!"

1. The boy repeated the words "Thank you, dear! You are a nice little boy!", because ____. [ ]

A. he was thinking about the words

B. he didn't understand the words

C. he wanted to talk to his dog

D. he liked talking to himself

2. What made the boy start his new life? [ ]

A. The people laughing at him.

B. The hard life.

C. The kind words spoken to him.

D. His lovely dog.

3. Which of the following is right according to the passage?[ ]

A. He never took good care of his friend, Tiger.

B. He usually had many friends around him.

C. He helped a young lady when her bag dropped.

D. He often washed his dirty face in the lake.

4. What may be the best title (题目) of this passage?[ ]

A. A Dog and a Boy

B. A Poor Boy's Childhood

C. A Businessman and a Boy

D. The Power of Kindness

人从深水区走向浅水区时，以下体验与分析合理的是[ ]

A、脚越来越疼，是因为水底对人支持力越来越大

B、脚越来越疼，是因为人受到重力越来越大

C、脚不疼，人越来越轻

D、脚不疼，人在竖直方向受到的始终是平衡力