5.下命题正确的是 ( )
A.“若,则
”的否命题是真命题
B.命题“,
”的否定是“
,
”
C.双曲线的渐近线方程为
D.“
”是“
”的必要不充分条件
4.已知全集,集合
,
,则
等于 ( )
A. B.
C.
D.
3.为了保护环境,发展低碳经济,甲、乙两企业在国
家科研部门的支持下,进行技术攻关,采用新工
艺,减少二氧化碳排放量。已知从2009年6月起
至2010年3月止,两企业每月的减排量如右图所
示,则甲、乙两企业在这10个月内月平均减排量
分别为 ( )
A.133,133 B.134,133 C.134,134 D.1343,134
2.585°的值是 ( )
A.
B.
C.
D.
1.复数等于 ( )
A.2 B.-2 C. D.
3.What does the passage mainly discuss?
A.The use of the psychology of spending money in business.
B.A special psychology of bargaining.
C.A method to help compulsive spenders to solve the problem of money.
2.According to the passage, compulsive bargain hunters constantly search for the lowest possible prices ______.
A.because they feel satisfied if they spend less money than others
B.because they have money problem
C.because they like to show off their success in getting things for less money
D.because they want to save money to help their budget
1.According to the passage, the greatest pleasure of crazy shopping for a compulsive spender is ______.
A.to get things they want
B.to meet their strong psychological need
C.to spend a lot of money
D.to meet their basic needs
9.Living across two centries, Ba Jin experienced many periods of danger and suffering but never lost his beliefs ______ a person should tell the truth and be an honest man.
A.what B.that C.when D.不填
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