母乳喂养儿患维生素D缺乏病较少的原因是因为母乳中()A．含维生素D多 B．含钙多 C

阅读理解。

    Scientists think that most animals can't see colors. The world is black and white to them.

    To find out if dogs could see colors, scientists gave dogs food every time they played a certain piece of

music. The dog got ready to eat only when they heard this piece of music. They did not get ready to eat

when they heard other piece of music.

    Then the scientists gave the dogs food every time they showed them a certain color. The dogs got ready

to eat when they saw this color. The scientists then showed the dogs another color. Again the dogs got ready

to eat. The colors were all the same to them.

    Colors are not all the same to the monkeys, however. For example, if we put food in a red box and do this

every day, a monkey will always go to the red box to get the food. If we then put food in a blue box, the

monkey won't go to it.

1. All colors are the same to           .[ ]

A. all animals

B. scientists

C. monkeys

D. dogs

2. Monkeys know that red and blue are           . [ ]

A. not the same

B. the same

C. colors

D. food

3. The scientists give the dogs food every time they           . [ ]

A. saw the color red

B. went to a box of food

C. saw the color blue

D. played certain music

4. Dogs are different from monkeys because           . [ ]

A. dogs can't see any colors and monkeys can

B. dogs can't see more colors than monkeys

C. monkeys can't see any colors and dogs can

D. monkeys can't see red and blue

5. Some            wanted to find out if dogs could see colors. [ ]

A. animals

B. doctors

C. scientists

D. monkeys

下列说法：（1）事件发生的概率可以是任意正数；（2）不确定事件的概率大于0而小于1；（3）不确定事件发生的概率是不确定的；（4）事件发生的概率可以等于事件不发生的概率，其中正确的（　　）

A．1个

B．2个

C．3个

D．4个

在我国，保险代理机构的组织形式主要包括( )、有限责任公司、股份有限公司三种。

A．合资企业

B．私营企业

C．合伙企业

D．个体企业

使用两个8259A进行级联，最大可以获得的有效硬件中断源的个数为()。

A．4个

B．8个

C．16个

D．15个

电容式液位计，当两电极半径比一定时，其灵敏度主要取决于两种介质的（）的差值。

A、电阻值

B、电容值

C、介电常数

D、电感值