“提案”的提出者是（ ）A．人大会代表 B．党代会代表 C．政协会代表 D．政府听

The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (51) this is largely because, unlike animals, we stand upright. This means that our noses are (52) to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces. In fact, (53) , we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of (54) human smells when these are diluted to far below one part in one million.

Strangely, some people find that they can smell one type of flower but not another, (55) others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate (56) smell receptors in the nose. These receptors are the cells which sense smells and send (57) to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when (58) to it often enough.

The explanation for insensitivity to smell seems to be that the brain finds it (59) to keep all smell receptors working all the time but can (60) new receptors if necessary.

59().

A.ineffective 

B.incompetent 

C.inefficient 

D.insufficient

甲京剧团与乙剧院签订合同演出某传统剧目一场，合同约定京剧团主要演员曾某、廖某、潘某出演剧中主要角色，剧院支付人民币1万元。演出当日，曾某在异地演出未能及时赶回，潘某生病在家，没有参加当天的演出，致使大部分观众退票，剧院实际损失1.5万元。后剧院向法院起诉京剧团，要求赔偿损失。针对此案，下列意见中何者为正确( )。

A．在这一事例中，法律关系主体仅为甲京剧团与乙剧院

B．京剧团与剧院的法律关系为保护性法律关系

C．京剧团与剧院的法律权利和法律义务都不是绝对的

D．在这一事例中，法律权利和法律义务针对的主体是不特定的

物上请求权与债权请求权的区别

煤的真密度随（）的增加而增大.

A.变质程度

B.泥炭化作用

C.增大

D.减小

溶质势