简述T+D产品和T+N产品的共同点和区别。

如图是A、B两种物质在一定的条件下实现循环转化的过程．下列说法不正确的是（　　）

A．若该循环为目前科学家提出的一种最理想的获得氢能源的循环体系，则急需解决的问题是寻找途径Ⅰ的催化剂

B．若该循环有绿色植物参与，则物质A、B中有一种属于单质

C．该循环过程中，途径Ⅰ一定是释放能量的

D．该循环可以实现太阳能转化为化学能

在研究匀变速直线运动的实验中，如图1所示为某次记录小车运动情况的纸带，图中A、B、C、D、E为相邻的计数点，相邻的两计数点间还有4个计时点未画出（答案保留小数点后一位）．

（1）根据纸带上所给出的数据，计算各点的瞬时速度，得vB=______m/s，vC=______m/s，vD=______m/s．

（2）在如图2所示的坐标系中，以打A点时为计时起点，作出小车的v-t图线，并根据图线求出a=______m/s²，纸带上A点的速度vA=______m/s．

多根牙牙周膜面积最大处位于（）

A.牙颈部

B.根分叉处

C.牙根中1／3处

D.牙根尖处

下列哪个是西方国家公务员制度的最根本特征？（）

A.公开考试、择优录用 

B.严格考核、功绩晋升 

C.政治中立、职务常任 

D.人事分类、依法管理

(C)

Can dogs and cats live in perfect harmony in the same home People who are thinking about adopting a dog as a friend for their cats are worried that they will fight. A recent research has found a new recipe of success. According to the study, if the cat is adopted before the dog, and if they are introduced when still young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along swimmingly. Two-thirds of the homes interviewed reported a positive relationship between their cat and dog.

However, it wasn’t all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes. One reason for this is probably that some of their body signals are just opposite. For example, when a cat turns its head away it signals aggression, while a dog doing the same signals submission.

In homes with cats and dogs living peacefully, researchers observed a surprising behavior. They are learning how to talk each other’s language. It is a surprise that cats can learn how to talk "Dog", and dogs can learn how to talk "Cat".

What’s interesting is that both cats and dogs have appeared to develop their intelligence. They can learn how to read each other’s body signals, suggesting that the two may have more in common than we previously suspected. Once familiar with each other’s presence and body language, cats and dogs can play together, greet each other nose to nose, and enjoy sleeping together on the sofa. They can easily share the same water bowl and in some cases groom (梳理) each other.

The significance of the research on cats and dogs may go beyond pets—to people who don’t get along, including neighbors, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance.

The underlined word swimmingly in Paragraph 1 is closest in meaning to（）

A. early

B. sweetly

C. quickly

D. smoothly