题目内容
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From the last paragraph we know that______.
A．forgetfulness is a response to learning
B．the memory storage system is an exactly balanced input-output system
C．memory is a compensation for forgetting
D．the capacity of a memory storage system is limited because forgetting occurs
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更多“From the last paragraph we kno…”相关的问题
A．once a computer has been programmed, it can do as much as one wishes
B．some instructions are embedded in some specialized automobile engines
C．programs can be built into hardware itself but can't exist independently
D．a general purpose computer contains some built in programs; therefore, it doesn't need external programs
A、in
B、 on
C、 of
D、 with
A．interpret the function of forgetting
B．illustrate the process of adapting
C．explain the performance of memory
D．emphasize the importance of learning
B．She will draw up a program.
C．She will join the "Green Movement".
D．She is not sure what she will do.
B．She begins to get on well with her parents.
C．She always stayed with her parents.
D．She rented a government house and lived alone.
All living things need water and man discovered that if this water is removed, the activity of the bacteria which causes food to go bad is prevented. In other words, we can protect some of our food by drying it. Besides, living things can only grow at certain temperatures, so we can also protect our food by heating or cooling it.
A New York man had an idea. He filled a wooden railroad car with tons of butter. The car was hooked to a train and pulled from New York to Boston. How could this be done？ The butter was packed in ice, and twice during the trip more ice was added. This was the first refrigerator ear. As a matter of fact, People also used wooden boxes filled with ice to keep their food. Now we have mechanical refrigerator cars and mechanical refrigerators at home and stores and other places that need them.
(33)
A．Food had to be kept in the ice box.
B．Fresh food must be eaten within one or two days after being shipped from the fame.
C．Food must be delivered from the farm within one or two days.
D．Food must be kept in the places near the farm.
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
The word conservation has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy m such good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials; most of them even until very recently, had the foolish idea that the treasures were "limitless" and "inexhaustible". Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in living body, an unhealthy condition of one part will sooner or later be harmful to all the others.
Fifty years ago nature study was not part of the school work; scientific forestry was a new idea; timber was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word "conservation" had nothing of the meaning that it has of us today.
For the sake of ourselves and those who will come after us, we must now set about repairing the mistakes of our forefathers. Conservation should, therefore, be made a part of everyone's daily life. To know about the water table in the ground is just as important to us as a knowledge of the basic arithmetic formulas. We need to know why all watersheds(流域) need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, mature trees, because living space for most of man's fellow creatures on this planet is figured not only in square measure of surface but also in cubic volume above the earth. In brief, it should be our goal to restore as much of the original beauty of nature as we can.
According to the author, the greatest mistake of our forefathers was that ______.
A．they had no idea of scientific forestry
B．they were not aware of the significance of nature study
C．they had little or no sense of environmental protection
D．they had no idea of how to make good use of raw materials
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