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问题 解答题

某商店进了一批商品，每件成本为5元，按每件6元出售，可销售80件；若每件提价0.5元出售，其销售量就将减少10件，但物价部门规定，商品的加价不得超过进价的55%；若商店销售这批商品要获利120元，则这种商品售价应定为多少元？该商店应进这种商品多少件？

答案

设每件售价应定为x元，根据题意，得

（x-5）[80-（x-6）÷0.5×10]=120

x1=7，x2=8．

当x=7时，利润率为（7-5）÷5×100%=40%；

当x=8时，利润率为（8-5）÷5×100%=60%（不合题意，舍去）．

当x=7时，80-（x-6）÷0.5×10=60．

答：这种商品售价应定为7元，该商店应进这种商品60件．

单项选择题

Many theories concerning the causes of juvenile delinquency(crimes committed by young people) focus either on the individual or on society as the major contributing influence. Theories (91) on the individual suggest that children engage in criminal behavior (92) they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through (93) with others. Theories focusing on the role of society suggest that children commit crimes in (94) to their failure to rise above their socioeconomic status, (95) as a rejection of middle, class values.
Most theories of juvenile delinquency have focused on children from disadvantaged families, (96) the fact that children from wealthy homes also commit crimes. The latter may commit crimes (97) lack of adequate parental control. All theories, however, are tentative and are (98) to criticism.
Changes in the social structure may indirectly (99) juvenile crime rates. For example, changes in the economy that (100) to fewer job opportunities for youth and rising unemployment (101) make gainful employment increasingly difficult to obtain. The resulting discontent may in (102) lead more youths into criminal behavior.
Families have also (103) changes these years. More families consist of one-parent households or two working parents; (104) , children are likely to have less supervision at home (105) was common in the traditional family (106) . This lack of parental supervision is thought to be an influence on juvenile crime rates. Other (107) causes of offensive acts include frustration or failure in school, the increased (108) of drugs and alcohol, and the growing (109) of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act, (110) a direct causal relationship has not yet been established.

A．interaction

B．assimilation

C．cooperation

D．consultation
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单项选择题

造成（）为特别重大事故。

A.30人以上死亡

B.10人以上30人以下死亡

C.3人以上10人以下死亡

D.3人死亡
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