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I don’t ______ (认为说出真相是明智的), because it hurts her a lot.

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In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key. （74）是（）

A. keep
B. keeped
C. keeping
D. kept

It would be interesting to discover how many young people go to university without any clear idea of what they are going to do afterwards. If one considers the enormous variety of courses 62 , it is not hard to see how difficult it is for a student to select the course most suited to his 63 and abilities. If a student goes to university to acquire a broader 64 of life, to enlarge his ideas and to learn to think for himself, he will 65 benefit. Schools often have too restricting an atmosphere, with its time tables and 66 , to allow him much time for independent 67 of the work he is asked to do. Most students would, I believe, 68 by a year of such exploration of different academic studies, especially those "all rounders" with no 69 interest. They should have longer time to decide in what subject they want to take their degrees, so 70 in later life, they do not look 71 and say, "I should like to have been an archaeologist. 72 I hadn’t taken a degree in Modern Languages, I shouldn’t have ended up as a(n) 73 , but it’s too late now. I couldn’t go back and begin all over again." There is, of course, another side to the question of how to make the best 74 of one’s time at university. This is the case of the student who excels in a particular branch of learning. He is immediately 75 by the University of his choice, and spends his three or four years becoming a specialist, emerging with a first-class Honour Degree and very 76 knowledge of what the rest of the world is all about. it 77 becomes more and more important that. If students are not to waste their 78 , there will have to be much more 79 information about courses and more advice. Only in this way can we be sure that we are not to have, on the one hand. a hand of specialists 80 of anything outside of their own subject, and on the other hand, an ever increasing number of graduates 81 in subjects for which there is little or no demand in the working world.

A. as
B. that
C. well
D. soon

Among the alternative energy sources,______, and coal are the cheapest forms today.

Questions 47 to 51 are based on the following passage. Japanese firms have achieved the highest levels of manufacturing efficiency in the world auto mobile industry. Some observers of Japan have assumed that Japanese firms use the same manufacturing equipment and techniques as United States firms but have benefited from the unique characteristics of Japanese employees and the Japanese culture. However, if this were true, then one would expect Japanese auto plants in the United States to perform no better than factories run by United States companies. This is not the case. Japanese-run automobile plants located in the United States and staffed by local workers have demonstrated higher levels of productivity when compared with factories owned by United States companies. Other observers link high Japanese productivity to higher levels of capital investment per worker. But a historical perspective leads to a different conclusion. When the two top Japanese automobile makers matched and then doubled United States productivity levels in the mid-sixties, capital investment per employee was comparable to that of United States firms. Furthermore, by the late seventies, the amount of fixed assets required to produce one vehicle was roughly equivalent in Japan and in the United States. Since capital investment was not higher in Japan, it had to be other factors that led to higher productivity. A more fruitful explanation may lie with Japanese production techniques. Japanese automobile producers did not simply implement conventional processes more effectively; they made critical change in United States procedures. For instance, the mass-production philosophy of United States automakers encouraged the production of huge lots of cars in order to utilize fully expensive, component-specific equipment and to occupy fully workers who have been trained to execute one operation efficiently. Japanese automakers chose to make small-lot production feasible by introducing several departures from United States practices, including the use of flexible equipment that could be altered easily to do several different production tasks and the training of workers in multiple jobs. Automakers could schedule the production of different components or models on single machines, thereby eliminating the need to store the spare stocks of extra components that result when specialized equipment and workers are kept constantly active. The historical perspective shows that the level of capital investment per work has nothing to do with ______.