问题 单项选择题

信息交替反转技术中的故意扰动在以下哪种数字-数字编码技术中采用?()

A.信息交替反转码(AMI)

B.双极性8零替换编码(B8ZS)

C.归零编码(RZ)

D.曼彻斯特编码

答案

参考答案:B

阅读理解

阅读理解。

     OUR KIDS ARE AMAZING-especially compared with everybody else's (who seem to cry all the time).

How do you show your love for your kids this holiday season? With toys that are smooth and colorful,

interactive and exciting. And with ones that have educational value-because you are the boss. 

     1. FLAX ART HOSPITAL PUZZLE AND PLAY SET

     Here is a toy that doesn't need power-and the kids have to put it together themselves. This 50-piece

puzzle set is made of soft-edged hardwood and makes a complete hospital, with an X-ray room. It also

includes eight patients, a car and a driver. $ 135; flaxart. com.

     2. TINY LOVE ACTIVITY BALL

     Sure, it's cool, but this colorful baby toy also develops problem solving and motor skills. It has a head and

legs, a magnetic (磁性的) hand and a tail. Suitable for little ones from 6 to 36 months. $ 19.95; tinylove.com.

     3. ROBOSAPIEN

     This small, remote-control robot is really powerful. It performs 67 preprogrammed functions (功能),

including throwing, kicking, picking up and dancing. You can even program your own function-which, sadly,

does not include doing windows. $ 99; robosapienonline. com.

      4. MINI PEDAL CAR

     Want a Mini Cooper but can't fit the family inside? Get one for the kids. They can jump into this Mini car,

which comes in hot orange with a single adjustable (可调的) seat, and ride away. But it could spoil them for

that used car they'll be driving when they turn 16. For ages 3 to 5. $ 189; mininss. com (click on "gear up,"

then "Mini motoring gear").

1. Which toy is said to have the special design for children's safety?

A. ROBOSAPIEN

B. MINI PEDAL CAR

C. FLAX ART HOSPITAL PUZZLE AND PLAY SET

D. TINY LOVE ACTIVITY BALL

2. Which toys are fit for three-year-old kids?

A. 1 am 3.

B. 2 and 4.

C. 1 and 2.

D. 3 and 4.

3. Educational value is mentioned in all the toys EXCEPT ______.

A. FLAX ART HOSPITAL PUZZLE AND PLAY SET

B. TINY LOVE ACTIVITY BALL

C. ROBOSAPIEN

D. MINI PEDAL CAR 

4. This passage is written for _______.

A. parents

B. children

C. the writer

D. the boss

单项选择题