吸进人体内的氧有2%转化为氧化性极强的活性氧,这些活性氧能加速人体衰老,被称为“

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问题:

吸进人体内的氧有2%转化为氧化性极强的活性氧,这些活性氧能加速人体衰老,被称为“生命杀手”,中国科学家尝试用Na2SeO3清除人体内的活性氧,则Na2SeO3的作用是[ ]

A.还原剂

B.氧化剂

C.既是氧化剂又是还原剂

D.以上均不是

考点:氧化剂、还原剂
题型:选择题

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were (1) from World Wide Websites that seemed to (2) almost daily a few years earlier, some people had predicted that consuners accustomed to shopping in stores would be (3) to buy things that they could not see or touch (4) . For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient (5) to driving to the store.

A research estimated that in 1998 US consumers could purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, (6) the rise of online auctions and Websites that did comparison shopping on the Internet for the best (7) .

For all the consumer interest, (8) in eyberspaee was still a largely (9) business, however. Internet pioneer Amazon. eom, which began selling books in 1995 and later (10) into recorded music and videos, posted (11) of $ 153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997. Overall, (12) , the company’ s loss widened to $ 45.2 million from $9.6 million, and analysts did not expect the company to turn a profit (13) 2001. (14) the great loss, Amazon. tom had a stock market value of many billions, reflecting investors’ (15) about the future of the industry.

Internet retailing appealed (16) investors because it provided an efficient means for reaching millions of consumers without having the cost of operating (17) stores with their armies of salespeople. Selling online carried its own risks, however, (18) so many companies competing tor consumers’ attention, price competition was (19) and profit (20) thin or nonexistent.

6()

A. in spite of

B. owing to

C. according to

D. in the light of

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刘某向保险公司投保了家庭财产保险。不久后刘某与妻子到外地学习,拜托刘某的姐姐替他们照看家中事务。某日,刘某的姐姐外出时忘记锁门,导致刘某家中被窃,财物遭受损失。下列关于保险公司责任承担说法正确的是()。

A.由于刘某的姐姐存在过错,保险公司可以不承担赔偿责任

B.由于刘某的姐姐存在过错,保险公司可以要求解除合同

C.由于刘某的姐姐存在过错,保险公司对刘某履行赔偿义务后,享有向刘某的姐姐进行追偿的权利

D.保险公司应当对刘某进行赔偿,且不得向刘某的姐姐追偿

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女性,35岁,活动后心慌气短2年,心功能评定为3级,心尖区可闻及舒张期隆隆样杂音及二尖瓣开瓣音。超声心动图示单纯二尖瓣狭窄,二尖瓣口面积<1.2cm,目前无风湿活动和感染的表现。该患者最佳的治疗方案是()。

A.β受体阻滞剂

B.经皮二尖瓣球囊成形术

C.人工瓣膜置换术

D.地高辛治疗

E.利尿剂治疗

题型:选择题

企业内部控制基本规范的核心内容是内部控制要素,下列属于内部控制要素的有()。

A.风险评估

B.内部环境

C.风险评估

D.信息与沟通

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在刘某杀人一案中,办理该案的侦查人员小李是被害人的表哥,而另一侦查人员小王后因工作调动,进入检察院,成为该案的审查起诉人员。本案合议庭组成人员如下:审判长甲,为刘某辩护人的表哥;审判员乙,曾担任过本案的勘验人;审判员丙,是刘某的岳父。本案一审判处刘某无期徒刑,刘某不服,提起上诉,二审法院以事实不清为由,撤销一审判决,发回原审法院重审,原审法院院长考虑到合议庭对该案情熟悉,仍由其担任本案的重审工作。请回答下列问题。

假设回避事由均成立,则刘某可对不同阶段的下列人员中的哪些提出回避申请 ( )

A.侦查阶段的侦查员小李

B.起诉阶段的审查起诉人小王

C.一审合议庭

D.重审合议庭

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