读某城市内部和对外联系路线图，最不可能发展成为商业中心的是 A．甲 B．乙 C．丙D

在计算机内部，用来传送、存储、加工处理的数据或指令都是以（）形式进行的。

A.十进制

B.八进制

C.二进制

D.十六进制

架设缆索，只能在端部立柱、中间立柱基础的基础强度达到80%以上设计强度时，才准予架设缆索。( )

阅读理解。

     Not long ago, people thought babies were not able to learn things until they were five or six months

old. Yet doctors in the United States say babies begin learning on their first day of life.

     Scientists note that babies are strongly influenced by their environment. They say a baby will smile

if her mother does something the baby likes. A baby learns to get the best care possible by smiling to

please her mother or other caregiver. This is how babies learn to connect and communicate with other

human beings.

      One study shows that babies can learn before they are born. The researchers placed a tape recorder

on the stomach of a pregnant woman. Then, they played a recording of a short story.  On the day the

baby was born, the researchers attempted to find if he knew the sounds of the story repeated while in

his mother. They did this by placing a device in the mouth of the newborn baby.

     The baby would hear the story if he moved his mouth one way. If the baby moved his mouth the

other way, he would hear a different story. The researchers say the baby clearly liked the story he heard

before he was born. They say the baby would move his mouth so he could hear the story again and again.

Another study shows how mothers can strongly influence social development and language skills in their

children.

     Researchers studied the children from the age of one month to three years. The researchers attempted

to measure the sensitivity of the mothers. The women were considered sensitive if they supported their

children's activities and did not interfere unnecessarily. They tested the children for thinking and language

development when they were three years old. Also, the researchers observed the women for signs of

depression.

The children of depressed women did not do as well in tests as the children of women who did not suffer

from depression. The children of depressed women did poorly in tests of language skills and understanding what they hear.

     These children also were less cooperative and had more problems dealing with other people. The

researchers noted that the sensitivity of the mothers was important to the intelligence development of their

children. Children did better when their mothers were caring, even when they suffered from depression.

1. According to the passage, which of the following is NOT the factor that influences intelligence

    development in babies?

A. The environment.

B. Mother's sensitivity.

C. Their peers (同龄人)  

D. Education before birth.

2. What is the purpose of the experiment in which newborn babies heard the stories?

A. To prove that babies can learn before they are born.

B. To prove that babies can learn on the first day they are born.

C. To show mothers can strongly influence intelligence development in their babies.

D. To indicate early education has a deep effect on the babies' language skills.

3.Which group of children did the worst in tests of language skills?

A. The children of depressed mothers who cared little for their children.

B. The children of women who did not suffer from depression.

C. The children of depressed but caring mothers.

D. Children with high communication abilities.

4. What is the main idea of the passage?

A. Scientific findings about how babies develop before birth.

B. Scientific findings about how the environment has an effect on babies' intelligence.

C. A study shows babies are not able to learn things until they are rice or six months old.

D. Scientific findings about how intelligence develops in babies.

In the two decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants’ subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.

But the question of who actually left the South has never been investigated in detail. Although numerous investigations document a flight from rural southern areas to southern cities prior to the Great Migration, no one has considered whether the same migrants then moved on to northern cities. In 1910 over 600,000 Black workers, or ten percent of the Black work force reported themselves to be engaged in "manufacturing and mechanical pursuits", the federal census category roughly including the entire industrial sector. The Great Migration could easily have been made up entirely of this group and their families. It is perhaps surprising to argue that an employed population could be tempted to move, but an explanation lies in the labor conditions then prevalent in the South.

About thirty-five percent of the urban Black population in the South was engaged in skilled trades. Some were from the old artisan class of slavery--blacksmiths, masons, carpenters--which had a monopoly of certain trades, but they were gradually being pushed out by competition, mechanization, and obsolescence. The remaining sixty-five percent, more recently urbanized, worked in newly developed industries--tobacco, lumber, coal and iron manufacture, and railroads. Wages in the South, however, were low, and Black workers were aware, through labor recruiters and the Black press, that they could earn more even as unskilled workers in the North than they could as artisans in the South. After the boll weevil infestation, urban Black workers faced competition from the continuing influx of both Black and White rural workers, who were driven to undercut the wages formerly paid for industrial jobs. Thus, a move north would be seen as advantageous to a group that was already urbanized and steadily employed, and the easy conclusion tying their subsequent economic problems in the North to their rural backgrounds comes into question.

It can be inferred from the text that the "easy conclusion" mentioned in the last sentence is based on the assumption that（）

A. people who migrate from rural areas to large cities usually do so for economic reasons

B. most people who leave rural areas to work in cities return to rural areas as soon as it is financially possible for them to do so

C. people with rural backgrounds are less likely to succeed economically in cities than those with urban backgrounds

D. most people who were once skilled workers are not willing to work as unskilled workers

密封的好坏会对（）造成很大影响。