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.

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单选题支气管哮喘发作时，呼气期两肺普遍性哮鸣音，其原因最主要是

单选题A．QRS波群增宽B．P波与QRS波群无关C．PR间期逐渐延长，继之QRS波群脱落，呈周期性D．PR间期固定，有时QRS波群脱落E．PR间期延长