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听力原文: Our family is trying to decide where to go for our vacation this summer. Our son Tom wants to go to Yellowstone Park again to see the hears. We did that last summer, and what an experience it was! When we got there we put up our tent and went to explore. As we returned, we heard our daughter Susie cry out and then we saw a bear enter our camp. Tom wanted his father to chase him away, His father said, 'No! It's dangerous to chase a bear. And don't let him chase you.' Susie said' What shall we do? May be we ought to climb a tree.' Tom said, 'No, we've got to get him out of there. He might go to sleep in our tent.''May be could make him leave if we put some honey outside for him to eat', Susie suggested. Then I said, 'How are you going to get the money? It's in the tent. ' We watched the bear enter the tent and heard him, upset everything inside. 'It's foolish for us to try to catch him.' said my husband, 'Leave him alone and wait for him to come out.' We waited, but the bear stayed inside. We had to sleep in the car. (35)
A.
They haven't reached a decision yet.
B.
They have decided to go hunting bears.
C.
They want to go camping.
D.
They want to go exploring the country.
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【单选题】现有一个关系:借阅(书号,书名,库存数,读者号,借期,还期),其中“借期”记录了借书的日期、时间。假如同一本书允许一个读者多次借阅,则该关系模式的主键是
A.
(书号,读者号,借期)
B.
书号
C.
读者号
D.
(书号,读者号)
【判断题】温度升高后,本征半导体内自由电子和空穴数目都增多,且增量相同
A.
正确
B.
错误
【单选题】Choisissez la bonne classe (nature) grammaticale de tout (déterminant, pronom ou adverbe). Barnabé mange des bonbons tous les jours.
A.
déterminant
B.
adverbe
C.
pronom
【简答题】现有一个关系:借阅(书号,书名,库存数,读者号,借期,还期),其中“借期”记录了借书的日期、时间。 假如同一本书允许一个读者多次借阅,则该关系模式的主码是()。A. (书号,读者号,借期) B. 书号 C. 读者号 D. (书号,读者号)
【单选题】本征半导体温度升高后 。
A.
自由电子数目增多,空穴数目基本不变
B.
自由电子数目基本不变,空穴数目增多
C.
空穴和自由电子数目都增多,且增量相同
D.
空穴和自由电子数目都基本不变
【判断题】电影是一门可以容纳悲喜剧与文学戏剧、摄影、绘画、音乐、舞蹈、文字、雕塑、建筑等多种艺术的综合艺术。
A.
正确
B.
错误
【简答题】(一)、一个图书借阅管理数据库要求提供下述服务: A .随时查阅书库中现有书籍的书号书名、数量与存放位置。所有各类书籍均可由书号唯一标识。B.可随时查询书籍借还情况。包括借书人单位、姓名、借书证号、借书日期和还书日期。我们约定:任何人可借多种书,任何一种书可为多个人所借,借书证号具有唯一性。 试画出反映图书、借书人及其借阅关系的ER图,并写出其逻辑关系模式。 (二)、为百货公司设计一个数据库管理系...
【单选题】能加速奎尼丁代谢,使血药浓度降低的抗心律失常药是
A.
普鲁卡因胺
B.
苯妥英钠
C.
普萘洛尔
D.
维拉帕米
E.
利多卡因
【单选题】本征半导体温度升高后,自由电子和空穴的变化情况是()。
A.
自由电子数目增加,空穴数目不变
B.
空穴数目增多,自由电子数目不变
C.
自由电子和空穴数目都增多,且增量相同
D.
自由电子和空穴数目不变
【判断题】同种色搭配的特点是有一种柔和、宁静的感觉。
A.
正确
B.
错误
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