It can be inferred from the passage that ______.
A. most sharks are dangerous to human beings
B. sharks only attack someone in black wet suits
C. movies and popular novels are always misleading
D. sharks are a valuable resource for human beings
By the second sentence of Paragraph 2, the author means to show that ______.
A. pigs attack human beings more frequently than sharks
B. people get hurt much more easily in a car accident
C. people get killed more easily by pigs or car accident than by sharks
D. sharks rarely kill human beings when they are not provoked to do so
根据我国现行规定，在计算企业所得税应纳税额时，准予扣除的项目不包括( )。
A. 救济性捐赠和各种赞助支出
B. 按计税工资总额的14%计算的职工福利费
C. 按计税工资总额的3%计算的工会经费
D. 年度应纳税额3%以内的公益性捐赠
下列关于关系数据模型和关系表的说法，正确的是______。 Ⅰ．关系数据模型以集合论为基础表示和处理数据 Ⅱ．关系数据模型同时支持非过程化语言和过程化语言直接存取数据 Ⅲ．“create table…”语句用于定义关系表的结构及数据完整性约束 Ⅳ．在关系表上执行select或delete操作时，DBMS会检查数据完整性约束
A. 仅Ⅰ和Ⅲ
B. 仅Ⅱ和Ⅳ
C. 仅Ⅲ和Ⅳ
D. 仅Ⅰ和Ⅳ
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