由于工程质量事故具有( )的特点，因此，要求在初始阶段对并不严重的问题应及时处理纠

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George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight. When George was fourteen, he became his father’s helper. He spent a lot of time learning about engines. And on holidays he often took one to pieces and studied each piece carefully. Soon he became a very good worker though he could not read or write. He began to learn the English letters when he was seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have lessons from a young school teacher. On his eighteenth birthday, he wrote his own name for the first time in his life. George invented many things in his life. The train was the greatest one among them. Today when we watch or take trains from one place to another, we will think of this great man -- George Stephenson.

小题1: In which year did George Stephenson start to help his father?

A．In 1781.

B．In 1789.

C．In 1795.

D．In 1798.小题2: He learned about the engine ______.

A．through reading and writing

B．by taking it to pieces and studying each piece carefully

C．at lessons from a young teacher

D．by asking a lot of questions小题3: He spent a lot of time learning about engines and soon became ______.

A．a great man

B．a good maker

C．a good worker

D．a good student小题4: George Stephenson ______ in his childhood.

A．didn’t go to school

B．had lessons from a very good teacher

C．lived an easy life

D．invented the train小题5: The passage tells us ______.

A．everybody should work hard for a living

B．one can start studying at school at the age of 18

C．George Stephenson liked working very much

D．hard work leads to success

鱼胆中含有胆汁酸（一种酸），它味苦、难溶于水。家庭做鱼的时候，不小心将鱼胆刺破，会使鱼肉沽上胆汁酸，影响鱼味道的鲜美。消除这种苦味，可用下面哪种溶液冲洗[ ]

A．食盐水

B．食醋

C．纯碱溶液

D．饮用白酒

检查胆系疾病的首选方法是

A．患侧甲状腺及峡部全切加对侧次全切除术
B．甲状腺局部切除
C．激素治疗
D．双侧甲状腺全切加放射性碘治疗
E．放射治疗

一声波波源相对媒质不动，发出的声波频率是v₀。设一观察者的运动速度为波速的1/₀，当观察者迎着波源运动时，他接收到的声波频率是：（）

A.2v₀

B.1/2v₀

C.v₀

D.3/2v₀

寒邪致病表现为疼痛的原因是（）

A.阻遏气机

B.寒邪伤阳

C.寒性凝滞

D.寒性收引

E.寒为阴邪