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问题 选择题

已知a∈R，函数f（x）=sinx-|a|，x∈R为奇函数，则a=（　　）

A．0

B．1

C．-1

D．±1

答案

因为f（x）是R上的奇函数，

所以f（0）=-|a|=0，

解得a=0，

故选A．

问答题

某市某化工厂于2001年8月20日在该市城郊以协议出让方式取得一宗国有土地使用权，面积为21000m2，用途为工业，使用年限45年，未办理土地登记。2003年9月该化工厂进行技术改造，由于资金不足，需要以该土地作为抵押物向银行申请贷款，但由于未办理土地使用权设定登记，随后该化工厂于2003年9月20日委托某土地登记，代理公司的土地登记代理人刘某代理土地登记申请手续。
问题
1．土地登记代理人刘某需要与该化工厂明确哪些方面的事项
2．根据《土地登记规则》的规定，土地登记代理人刘某需要收集哪些权属来源资料
3．出让国有土地使用权设定登记权属资料核实的要点包括哪些
4．土地登记代理人刘某在填写土地登记申请表时要注意哪些方面的内容
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单项选择题

Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures rise; if a bountiful corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop’s survival, prices of corn futures will fall sharply today.
Which of the following, if true, most weakens the argument above

A．Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.

B．Futures prices for corn have been fluctuating more dramatically this season than last season.

C．The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.

D．Agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season.

E．(E) Most people who trade in corn futures rarely take physical possession of the corn they trade.
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