5MHz表示()A．每秒50万周 B．每秒5千万周 C．每秒5千周 D．每秒5百万周

阅读理解。

    Mr Baker worked in a big factory. He was busy all the time and had little time to rest.

    One summer, he decided to go to the sea to spend his holidays.

    One afternoon, it was very hot. Mr Baker came into a restaurant, sat at a table and wanted to drink.

Just then, an old man came up to him and said, "How do you do, sir?" "How do you do?" Mr Baker asked

the old man to sit next to him. "Have you been here before?" "No, I haven't." "You look lonely, don't you?"

said the old man. "Let's have a bet, shall we?"

    It interested Mr Baker, "But what shall we bet on?" "I can bite my left eyeball," said the old man, "I can

bet you five dollars."

    Mr Baker didn't believe and passed $5 on the table.

    The old man took out his glass eyeball, put it into his mouth and bite it. Mr Baker had to give his money.

    "It doesn't matter young man," the old man said. "I'll give you a chance to win the money back. I can

also bite my right eye. I'll bet you $10."

    "I'm sure he's able to see. And I must win his money," he thought. So he took out ten dollars from his

wallet.

     But he was very surprised, the old man took out his false (假的) teeth and bit his right eye with it. Then

he put the money into his pocket and went away quickly.

1. Mr Baker went to the sea ______. [ ]

A. to swim　　　

B. to have a rest　　　

C. to drink something　　　

D. to make a bet

2. The old man said hello to Mr Baker because ______. [ ]

A. they were good friends

B. he wanted to ask for some food

C. he wanted to drink with him

D. he wanted to win money

3. After the old man knew ______, he began to make a bet with the young man.[ ]

A. Mr Baker was there for the first time

B. Mr Baker wanted to win the five dollars back

C. Mr Baker knew he had false teeth

D. Mr Baker wasn't clever enough

4. As ______, he bet the old man ten dollars. [ ]

A. Mr Baker didn't think him blind (瞎的) in both eyes

B. Mr Baker wanted to win the five dollars back

C. Mr Baker knew he had false teeth

D. Mr Baker wanted to help him in another way

5. The old man was blind in ______. [ ]

A. both eyes　　

B. neither eye　　

C. the right eye　　

D. the left eye

在西周初年，下列哪个人被封为诸侯王的可能性最小（   ）

A．甲是商朝末年的贵族，带兵抵抗周部落进攻，兵败后降周

B．乙是西周王族成员，整日无所事事

C．丙带兵攻打商纣王，为周王朝的建立立下了汗马功劳

D．丁是商朝末年的平民，才能、人品俱佳

抗原抗体反应的主要特点是（）

A.阶段性

B.可逆性

C.特异性

D.不可逆性

E.非特异性

下图是北美洲伊斯帕尼奥拉岛（即海地岛）1493—1570年人口变化图，导致这一变化的主要因

素是

①殖民者残酷的奴役剥削②大批土著被贩卖到欧洲 

③传染疾病的肆虐④工业生产污染严重

A．①②④

B．②③

C．①③

D．①③④

各单位内部使用的财务报告，其格式和要求必须符合国家统一的会计制度的规定。 ( )