One day an old man is selling a big elephant. A young man comes to the elephant and begins to look at it slowly. The old man goes up to him and says in his ear, “ Don’t say anything about the elephant before I sell it. Then I will give you twenty dollars.”“All right,” says the young man. After the old man sells the elephant, he gives the young man twenty dollars and says, “ Now, can you tell me how you found the elephant’s bad ears?”“ I didn’t find the bad ears,” says the young man. “ Then why are you looking at the elephant slowly?” asks the old man. The young man answers, “Because I have never seen an elephant before, and I want to know what it looks like.”

(   )1. ______ the elephant.

A. The young man sells      B. The old man sells

C. The two men sell         D. The old man buys

(   )2. The young man is looking at the elephant slowly. He wants to find out _______.

A. which foot of the elephant is bad    B. how heavy it is

C. which ear of the elephant is bad     D. what it looks like

(   )3. The young man _______.

A. knows the elephant has bad ears   B. wants to buy the elephant

C. looks after the elephant   D. gets some money from the old man

(   )4. The young man _______.

A. is not interested in elephants    B. knows what an elephant looks like

C. has seen some elephants before

D. has never seen an elephant before

(  )5. Hearing what the young man said, the old man will probably(可能) be ______

A. angry      B. happy      C. dangerous     D. hungry

下列实验现象描述不正确的是（　　）

A．镁条在空气中燃烧发出耀眼的白光，生成白色固体

B．硫在空气中燃烧，产生淡蓝色火焰

C．细铁丝在氧气中剧烈燃烧，火星四射，生成黑色固体

D．一氧化碳在空气中燃烧发出蓝紫色火焰