题目

下列说法中错误的是( ) ①化学性质相似的有机物是同系物②分子组成相差一个或几个CH2原子团的有机物是同系物③烷烃的同分异构体中支链数越多,其沸点越高④互为同分异构体的两种有机物的物理性质有差别，但化学性质必定相似A.①②③④          B.只有②③          C.只有③④         D.只有①②③五、阅读理解       When Mark first arrived in Thailand,he saw an old man selling something cheap in the street of Chiang Mai. The old man was one of the poor people in Chiang Mai and there was no difference from beggars (乞丐) . Most of them were some lonely old people. Their life had no support.        Mark was a kind man,so he-gave some changes to him without thinking. The old man told him to pick something he liked. Mark didn't choose anything and left.        But the old man followed him closely. At first,Mark didn't think a lot,just thinking he wanted to go home. But when he went out very far,he saw the old man still following him. He was a bit tired,thinking the old man must feel he was kind and wanted to ask for more money from him.        Mark turned back and told him not to follow him because he didn't have much money. But the old man seemed not to understand what he meant,still following him. The bag on his back made him sweat (流汗) all over.        Mark happened to meet his Thai colleague (同事) in the street and his colleague heard this. The colleague turned to ask why the old man was following his friend.        The old man said out of breath, “My son,you gave me money,but didn't want my things,so I have to give you something. I see you are a foreigner and you are not familiar (熟悉) with this place. I just want to follow you and show you the way. All I can do for you is this. ”        Mark was surprised. He said he felt the old man was just like his father,but he didn't know why.() 1. What did Mark do when he first found the old man following him?   A. He didn't think a lot and went on walking.   B. He asked the old man why he was following him.   C. He was surprised and asked his colleague to come.   D. He gave him more money without thinking.() 2. Which of the following is true according to the passage?   A. Mark didn't like this old man at all.   B. The old man was Mark’s father.   C. The old man sold something cheap to make a living.   D. Mark didn’t give the old man anything at the beginning.() 3. How did Mark feel about the old man at last?   A. He felt doubt (怀疑) if the old man was a thief (小偷) .   B. He felt pity for the old man.   C. He felt angry with the old man.   D. He felt the old man was kind and warm.