病历摘要：患者男性，38岁，右眼前有黑影漂动十天伴下方视物不清七天，不伴有红肿及眼痛

阅读短文，选择正确答案。

    Here are some facts about homes in the United States and the people who live in them. In the early 1990s,

about 50% of the Americans own their homes and the rest rent (租) their homes. The rented homes are usually

apartments (公寓).

    74% of the people in the US make their homes in or around cities. 26% live in the country. Dogs live in about

40% of all homes in the US. About half that number have cats.

    Families in the US are becoming smaller. On the average (平均), 2.64 people lived in a home in early 1990s.

In 1960, the average was 3.5.

    Half of the teenagers in the US have their own bedrooms.

    An American moves, on the average, twelve times in his or her life. In Japan a person moves about five times,

and in England a person moves eight times.

1. According to (根据) the passage, where do most Americans live? [ ]

A. in the countries

B. around the farms

C. in the towns near the sea

D. in or around the cities

2. How many American families own a cat? [ ]

A. 40%

B. 26%

C. 74%

D. 20%

3. Families in the US are ________. [ ]

A. becoming bigger

B. becoming smaller

C. no change

D. not sure

4. Do all the children in the US have their own bedrooms? [ ]

A. Yes, they do.

B. No. Half of them do.

C. No, 5% of the them do.

D. I don't know.

5. The passage is about ________. [ ]

A. people and homes in the United States.

B. dogs and cats in American homes.

C. teenagers' bedrooms.

D. moving house.

检查网络计划时，发现某工作尚需作业a天，到该工作计划最迟完成时间尚剩b天，原有总时差为c天，则该工作尚有总时差为( )天。

A．c-a

B．c-b

C．a-b

D．b-a

钻井打捞作业民爆品作业人员必须取得什么证书？

某厂因扩建招收一批操作工，上岗后工人提出与厂方签订劳动合同，可厂方一直不予办理。后来，厂方又提出每人交纳4000元抵押金，并注明工人一旦违反厂规厂纪，抵押金就要没收。更为严重的是，未经工人同意，厂方单方面签订了劳动合同。厂方的这种做法，侵犯了劳动者（）。

A、与用人单位平等协商签订劳动合同的权利

B、获得劳动报酬的权利

C、劳动者休息、休假的权利

D、获得劳动安全和卫生保护的权利

检修列控车载设备不得随意更改哪些设置？