It is difficult to imagine what life will be like without memory．The meanings of thousands of everyday perceptions(感觉、知觉), the bases for the decisions we make, and the roots of our habits and skills are to be found in our past experiences, which are brought into the present by memory．

Memory can be defined as the capacity to keep information available for later use．It includes not only “remembering” things like arithmetic or historical facts, but also involves any change in the way an animal typically behaves．Memory is involved when a rat gives up eating grain because he has sniffed something suspicious in the grain pile．Memory is also involved when a six-year-old child learns to swing a baseball bat．

Memory exists not only in humans and animals but also in some physical objects and machines．Computers, for example, contain devices from storing data for later use．It is interesting to compare the memory-storage capacity of a computer with that of a human being．The instant-access memory of a large computer may hold up to 100,000 “words”—ready for instant use．An average U．S．teenager probably recognizes the meaning of about 100,000 words of English．However, this is but a fraction(部分、片断) of the total amount of information which the teenager has stored．Consider, for example, the number of faces and places that the teenager can recognize on sight．

The use of words is the advanced problem-solving intelligence of human beings．A large part of a person’s memory is in terms of words and combinations of words．

1．According to the passage, memory is considered to be ________．

A．the basis for decision making and problem solving

B．an ability to store experiences of future use

C．an intelligence typically possessed by human beings

D．the data mainly consisting of words and combinations of words

2．The comparison made between the memory capacity of a large computer and that of a human being shows that ________．

A．the computer’s memory has a little bigger capacity than a teenager’s

B．the computer’s memory capacity is much smaller than an adult human being’s

C．the computer’s memory’s capacity is much smaller even than a teenager’s

D．both A and B

3．The whole passage implies that _______．

A．only human beings have problem-solving intelligence

B．a person’s memory is different from a computer’s in every aspect

C．animals are able to solve only very simple problems

D．animals solve problems by instincts rather than intelligence

4．The phrase “in terms of” in the last sentence can best be replaced by ________

　 A．in connection with　　　　　　 　　 B．expressed by

C．consisting　　　　　　　　　　　　 　 D．by means of

5．The topic of the passage is __________．

A．What would life be like without memory?

B．Memory is of vital importance to life．

C．How is a person’s memory different from an animal’s or a computer’s?

D．What is contained in memory?

It is difficult to imagine what life would be like without memory. The meanings of thousands of words, the bases for the decisions we make, and the roots of our habits and skills are to be found in our past experiences, which are brought into the present by memory.

Memory can be considered as the ability to keep information available for later use. It includes not only “remembering” things like maths or historical facts but also involves（包括）any change in the way an animal acts . Memory is involved when a rat gives up eating grain because he has smelt something different in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.

Memory exists not only in humans and animals but also in some physical objects and machines. Computers, for example, contain equipment for storing data for later use. It is interesting to compare the memory-storage ability of a computer with that of a human being. The instant-access memory(快速记忆) teenager probably recognizes the meanings of about 100,000 words of English. However, this is only a piece of total amount of information which the teenager has. For example, the teenager can recognize a large number of faces and places.

The use of words is the basis of the advanced problem-solving intelligence of human beings.

A large part of a person’s memory is in terms of words and combinations (组合) of words .

66. According to the passage, memory is considered to be 　　　　.

A. the basis for decision making

B. an ability to store information for future use

C. an ability owned only by human beings

D. the data mainly made up of words

67. From Paragraph 3 we can know that 　　　　.

A. the computer’s memory has a little bigger ability than a teenager’s

B. the computer’s memory ability is the same as a teenager’s

C. the computer’s memory ability is much smaller even than a teenager’s

D. the computer’s memory ability is as small as a teenager’s

68. The whole passage implies (暗示) that 　　　　.

A. only human being can solve problems

B. a person’s memory is different from a computer’s in every way

C. animals can only solve very simple problems

D. animals solve problems by intelligence

69. In people’s memory, ________ play the most important part in solving problems.

A. language　　　　　　 B. skills　　　　　　 C. experiences　　　　 D. habits

70. The main idea of this passage is 　　　　.

A. life will not change without memory

B. memory is of great importance to life

C. how a person’s memory is different from a computer’s

D. what is contained in memory

DNA is one of the most important discoveries in science. DNA is the plan for the human being, as a blueprint is the plan for a building. DNA makes a person look the way he does. A person’s DNA comes from a mixing of his parents’ DNA. That’s why a child looks like his parents. But, besides controlling things such as height and hair color, DNA can also give people diseases. Scientists are now studying DNA to cure diseases.
In the seventies, scientists developed a process called recombinant or RDNA. Although it sounds difficult to understand, RDNA simply means taking DNA from one animal or plant and putting it into another. By doing so, scientists can create new beings. In doing so, scientists can better understand DNA, especially what parts of DNA do what. After they understand DNA, scientists can begin to cure diseases. Often, the new being created will itself be the cure.   Besides curing diseases, RDNA research can also do other things. For example, scientists in Japan have already created “super-trees”. Trees help humans, because they take CO₂, which poisons humans, from the air and turns it into oxygen, which lets humans breathe. “Super-trees” do this too, but do it much faster. As things such as cars and factories have already put much CO₂ in the area, “super-trees” are badly needed.
Unfortunately, there is a serious danger in RDNA research. Scientists want to create animals to cure old diseases, but these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural, they may let loose many new powerful diseases.
As a result, RDNA research will create many solutions, but it will also create many problems.
【小题1】 From the passage, we can know that a boy looks like his parents because______.