锤头松了，把锤柄的一端在固定的物体上撞击几下，锤头就紧套在锤柄上，这是为什么？

阅读理解。

     A man was travelling abroad in a small red car. One day he left the car and went shopping. When he came

back, its roof was badly damaged.

     Some boys told him that an elephant had damaged it. The man did not believe them, but they took him to a

circus which was near there. The owner of the elephant said, I am very sorry! My elephant has a big, round,

red chair. He thought that your car was his chair, and he sat on it!

     Then he gave the man a letter, in which he said that he was sorry and that he would pay for all the damage.

     When the man got back to his own country, the customs officers would not believe his story. They said,

You sold your new car while you were abroad and bought this old one! It was only when the man showed

them the letter from the circus man that believed him.

1.A man was travelling abroad ______. [ ]

A.in a big bus

B.in a green jeep

C.in a red car

D.in a red taxi

2.The car was damaged because ______. [ ]

A.there was a traffic accident

B.the circus man broke it

C.it rushed into a shop

D.the elephant sat on it

3.The circus man said that ______. [ ]

A.he would pay for part of the damage

B.he would pay for all of the damage

C.he wouldn't pay for the damage

D.he would buy a new car

4.When the man got back to his country, the customs officers ______. [ ]

A.would check his new car

B.only checked his car

C.searched him

D.wouldn't believe what he had said,

5.It was only ______ that made the officers believe him. [ ]

A.the letter from the circus man

B.a newspaper from the country

C.the certificate of his

D.the letter from the government

恶性淋巴瘤B组症状是半年内体重减轻多少()

A．20%以上

B．5%以上

C．40%以上

D．15%以上

E．10%以上

引起LM曲线变得平缓的原因可能是（）。

A.货币需求对收入变动的反应程度和货币需求对利率变动的反应程度同比例增强。

B.货币需求对收入变动的反应程度和货币需求对利率变动的反应程度同比例减弱。

C.货币需求对收入变动的反应程度增强，货币需求对利率变动的反应程度减弱。

D.货币需求对收入变动的反应程度减弱，货币需求对利率变动的反应程度增强。

最优化原则是指在选择过程中诊疗方案以最小的代价、获取最大效果，具体要求是（）

A.痛苦最小

B.耗费最少

C.疗效最佳

D.安全无害

E.以上都是

不良贷款率是评价商业银行信贷资产安全状况的重要指标之一，不良贷款率越高，可能无法收回的贷款占总贷款的比例越大。