单选题A "poker face" in the second paragraph refers to a face which is ______.

单选题 Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time: if corrected too much, he will stop talking. He notices a thousand times a day the differences between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people's. In the same way, children learning to do all the other things they learn to do without being taught -- to walk, run, climb, whistle, ride a bicycle -- compare their own performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his mistakes for himself, let alone correct them We do it all for him. We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Soon he becomes dependent on the teacher. Let him do it himself. Let him work out, with the help of other children if he wants it, what this word says, what the answer to that problem is, whether or not this is a good way of saying or doing this or not. If it is a matter of right answers, as it may be in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can't find the way to get the right answer. Let's end all this nonsense of grades, exams, and marks. Let us throw them all out, let the children learn what all educated persons must some day learn and how to measure their own understanding, and how to know what they know or do not know. Let them get on with this job in the way that seems most sensible to them, with our help as school teachers if they ask for it. The idea that there is a body of knowledge to be learned at school and used for the rest of one's life is nonsense in a world as complicated and rapidly changing as ours. Anxious parents and teachers say, "But suppose they fail to learn something essential, something they will need to get on in the world?" Don't worry! If it is essential, they will go out into the world and learn it.

单选题[此试题无题干]

单选题Money can make good health because ______.

单选题Whatcanweinferfromtheconversation?

单选题 IQuestions 11～13 are based on the following dialogue./I

单选题Whendidthemangraduate?

单选题He ______ into the office building when the fire bell rang. [A] goes [B] has gone [C] was going

单选题Whatisthemandoing?

单选题Whycan'tthewomandecidetogoabroad?

单选题The evolution of artificial intelligence is now proceeding so rapidly that (26) the end of the century cheap computers (27) larger than portable typewriters will (28) , and that will be able to solve almost any (29) faster and more efficiently than we can. "Intelligence" in a machine, (30) in a human, is best (31) as the ability to solve complex problems swiftly. This (32) involve medical analysis and prescriptions, (33) legal matters— (34) short, replacing the profession of lawyers completely—or in (35) war-grams, in other words (36) governments whether (37) not to go to war. (38) computers have already intensified the deadlines of weapons, the prospect for the future is that they will (39) the more beneficial role of preventing wars. (40) asked to estimate the chances of victory, the computer will analyze facts (41) from the lire-long military expert with his optimistic sense and military enthusiasm. When the same figures are fed into the emotionless machine each to be weighed with (42) objective and then judged (43) each other, the (44) , far more often than (45) in human decision-making, will be: "You start this war you will lose./

单选题To work out a person's mental ratio, one must ______.

单选题 IQuestions 11-13 are based on the following dialogue./I