阅读理解。
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
放在木板的最右端，不计铁块与木板间的摩擦，且小铁块视为质点，求小铁块经过多长时间将离开木板。（g＝10 m/s2 ）
