猪出血性痢疾的病原体属于（） A.细菌 B.真菌 C.螺旋体 D.病毒 E.支原体

阅读短文，选择正确答案。

     What might the future be like? Here are some predictions: things to come, things to go.

     The Spring Festival, the most important Chinese holiday when everyone returns home, has caused headaches

for millions of Chinese. More than 2 billion people travel at the same time, making getting travel tickets and the

journey difficult. But in 28 years, Spring Festival travel may not be a problem at all. China plans to build more

than 120,000 kilometers of railway and a fast transportation network that will serve 90% of the population by

2020. And because most of China will be cities, people will not have to go to other places to find a job, so it will

no longer be a problem. 

     Newspaper will come to an end in 2043. In the future, digital (数字的) newspapers will be sent to personal

web tools through Internet. Readers can discuss topics with journalists and editors. Information will move

faster.

     Oil is running out faster than expected. But scientists have found something else for oil as fuel (燃料). Coal,

natural gas, solar power, nuclear power and even water can take the place of oil as sources of energy (能源).

     Schools will go electronic (电子化). Computers will be important and popular among the students.

Everything will be in the computer and students will not need to bring books to school. They will find

information on the Internet. A computer will be the students' library, schoolbag and connection to the outside

world. There will be robot teachers, they will check homework on computers and communicate with the

students' parents through e-mail. And school buses will be like spaceships, comfortable and safe.

1. More than 2 billion people have a hard time returning home during              . [ ]

A. Christmas Day

B. National Day

C. the Spring Festival

D. the Mid-autumn Festival

2. The newspapers will disappear              . [ ]

A. in 28 years

B. by 2020

C. by 2053

D. in 33 years

3.              is not mentioned in the passage as sources of energy. [ ]

A. Coal

B. Wind

C. Nuclear power

D. Water

4. From the passage we can know              in the future. [ ]

A. the Spring Festival travel may still be a problem

B. 90% of the population will live in the city

C. robot teachers will check homework

D. readers can discuss topics with each other through Internet

5. What's the main idea of the last paragraph? [ ]

A. Schools will go electronic

B. Computers will be important

C. There will be robot teachers

D. School buses will be like spaceships

互质数不一定都是质数。[ ]

不正当竞争是指经营者违反《反不正当竞争法》的规定，损害其他经营者的合法权益，扰乱社会经济秩序的行为。所谓经营者是指从事商品经营或营利性服务的法人。根据上述定义，下列不属于不正当竞争行为的是( )。

A．某地下工厂生产出来的劣质酒贴上名牌酒的商标出售

B．某厂采用先进技术，降低成本后降低价格以占据有利的市场地位

C．某公司盗取同行的商业秘密，事先准备好与其竞争的策略

D．微软将它的浏览器与Windows操作系统捆绑在一起销售

如图，弹簧一端固定在O点，另一端系一小球。现将小球置于A位置，此时弹簧水平且为原长状态。将球由静止释放，在运动到最低点B的过程中。下列说法正确的是（          ）

A．小球机械能守恒

B．小球机械能逐渐减小

C．小球减小的重力势能等于增加的动能

D．弹簧弹力对小球不做功

光电缆标石标徽喷（）色油漆。

A.黑

B.红

C.白

D.绿