单选题He didn't do so well in the race ______ his training.

单选题For generations，the Nganyi people of western Kenya have served as rainmarkers，helping local communities decide when best to prepare their land and SOW their seeds.By observing subtle changes in nature

单选题The plan would require two, or possibly more, class periods for its fulfillment .

单选题After graduation, he won the famous Rhodes Scholarship and ______ advanced studies for 2 years in Oxford University in England.

单选题We ______ go abroad to spend my holiday, but this morning the manager informed me that I had to take part in an important meeting. A. intended to B. have intended to C. had intended to D. were intending

单选题Hearing the news, she could feel anger ______ inside her.

单选题What will the succeeding paragraph, should there be one, most probably discuss?

单选题Couples are restricting the size of their families in the UK because of cash worries brought on bvthe financial crisis and the subsequent decline.We’re now up to nearly 3.7 million families whelthere

单选题The boy showed complete ______ of his parents' advice. ( )

单选题I gave John a present but he gave me nothing______.

单选题The seminar, ______ by the Nobel Prize winner, probes the problem of wildlife extinction in African countries.

单选题All the students finished the test ______ the given time. A. at B. by C. till D. within

单选题She is (furious of) her son's grades in school, (which) explains why Mark is jealous (of) Julia's high marks (on) the exam.

单选题The problem to be taken up and the point at which the search for a solution will begin are customarily prescribed by the investigator (1) a subject participating in an (2) on thinking (or by the programmer for a computer). (3) , prevailing techniques of (4) in the psychology of thinking have invited (5) of the motivational aspects of thinking. The conditions that determine when the person will begin to think in (6) to some other activity, what he will think about, what direction his thinking will take, and when he will regard his search for a solution as successfully terminated (or abandon it as not worth pursuing further) (7) are beginning to attract investigation. (8) much thinking is aimed at (9) ends, special motivational problems are raised by "disinterested" thinking, in which the (10) of an answer to a question is a source of satisfaction in itself. For computer specialists, the detection of a mismatch between the formula that the program so far has (11) and some formula or set of requirements that (12) a solution is what impels continuation of the search and determines the direction it will (13) . Neo-behaviorists (like psychoanalysts) have made much of secondary (14) value and stimulus generalization; i. e. , the tendency of a stimulus pattern to become a source of satisfaction if it resembles or has (15) accompanied some form of biological gratification. The insufficiency of this kind of explanation becomes apparent, (16) , when the importance of novelty, surprise, complexity, incongruity, ambiguity, and (17) is considered. Inconsistency between beliefs, between items of incoming sensory information, or between one's belief and an item of sensory information (18) can be a source of discomfort impelling a (19) for resolution through reorganization of belief (20) or through selective acquisition of new information.

单选题— Don't touch the papers. —Certainly. I'll ______the papers be touched.

单选题They finally managed to climb to the top，but ______ then．A．went the children down the hillB．down the hill did the children goC．down the hill went the childrenD．down the hill the children went

单选题It is useful to be able to predict the extent ______ which a price change will affect supply and demand. A. from B. with C. to D. for

单选题I"m sorry to ______ you while you"re working but I must ask you a question.

单选题 The newly designed system is ______ to genetic transfections, and enables an incubation period for studying various genes.

单选题By what means do the children of the author' s family go to school?