下列属于外来机动车设施应设置的地方的是（）A.城市外来环路 B.城市主要出入干道口

From the passage we can learn that ______

A．natural flavorings and fragrances are not quite dear

B．the limitation of natural flavorings and fragrances is clear

C．the supply of natural flavorings and fragrances is adequate to meet the demand

D．the cost of producing natural flavorings and fragrances is high

阅读理解

     We may all have had the embarrassing moment:Getting halfway through a story only to realize that

we've told this exact tale before to the same  person. Why do  we  make  such  memory mistakes?

     According to the research published in Psychological Science, it may have to do with the way our

brains process different types of memory.

     Researchers Nigel Gopie, of the Rotman Research Institute in Toronto, and Colin Macleod, of the

University of Waterloo, divided memory into two kinds. The first was source memory,  or the ability to

keep track of where information is coming from. The second was destination memory,  or the ability to

recall who we have given information to.

     They found that source memory functions better than destination memory, in part because of the

direction in which that information is travelling.

     To study the differences between source memory and destination memory, the researchers did an

experiment on 60 university students, according to a New York Times report. The students were asked

to associate (联想) 50 random(随意的) facts with the faces of 50 famous people. Half of the students

"told"each fact to one of the faces, reading it aloud when the celebrity's(名人的) picture appeared on a

computer screen. The other half read each fact silently and saw a different celebrity picture afterward.

     When later asked to recall which facts went with which faces, the students who were giving

information out(destination memory)scored about 16 percent lower on memory performance compared

with the students receiving information(source memory).

     The researchers concluded that outgoing information was less associated with its environmental

context (背景)-that is,  the person-than was incoming information.

     This makes sense given what is known about attention. A person who is giving information, even little

facts, will devote some mental resources to thinking about what is being said. Because our attention is

limited,  we give less attention to the person we are giving information to.

     After a second experiment with another group of 40 students, the researchers concluded that

selffocus is another factor that undermines destination memory.

     They asked half the students to continue giving out random information, while the other told things

about themselves. This time around, those who were talking about themselves did 15 percent worse

than those giving random information.

     "When you start telling these personal facts compared with nonself facts, suddenly destination

memory goes down more, suggesting that it is the selffocus component (成分) that's reducing the

memory."Gopie told Live Science.

1. The point of this article is to ________.

A. give advice on how to improve memory

B. say what causes the memory to worsen

C. explain why we repeat stories to those we've already told them to

D. discuss the differences between source memory and destination memory

2. What can we learn from the article?

A. Source memory helps us remember who we have  told the information to.

B. One's limited attention is one of the reasons why those reading aloud to the celebrity's pictures    

     perform worse on the memory test.

C. Silent reading is a better way to remember information than reading aloud.

D. It tends to be more difficult for people to link incoming information with its environmental context

     than outgoing information.

3. The underlined word"undermines" probably means________.

A. weakens    

B. benefits

C. explains  

D. supports

4. What did the scientists conclude from the second experiment?

A. Destination memory is weaker than source memory.

B. Focusing attention on oneself leads to relatively poor source memory performance.

C. Associating personal experience with information helps people memorize better.

D. Selffocus is responsible for the reduction of destination memory.

的面具有（）。

A.4个三角嵴，5个点隙，3条发育沟

B.4个三角嵴，4个点隙，4条发育沟

C.4个三角嵴，3个点隙，5条发育沟

D.5个三角嵴，2个点隙，5条发育沟

E.5个三角嵴，1个点隙，4条发育沟

如图所示，一个圆弧形光滑细圆管轨道ABC，放置在竖直平面内，轨道半径为R，在A点与水平地面AD相接，地面与圆心O等高，MN是放在水平地面上长为3R、厚度不计的垫子，左端M正好位于A点，将一个质量为m、直径略小于圆管直径的小球从A处管口正上方某处由静止释放，不考虑空气阻力

（1）若小球从C点射出后恰好能打到垫子的M端，则小球经过C点时对管的作用力大小和方向如何？

（2）欲使小球能通过C点落到垫子上，小球离A点的最大高度是多少？

以下有关新生儿胎便的特点，哪项是错误的

A．早产儿胎便排出常延迟

B．由肠黏膜脱落的上皮细胞、羊水及消化液组成

C．墨绿色

D．新生儿6h内排出胎便

E．2～3d排完