出票人签章不符要求的，票据无效；背书人在票据上的签章不符要求的，票据同样丧失法律效力

热带雨林是地球上功能最强大的生态系统，也是生产力最高的生物群落。雨林的前途―把保护放在第一位。据此回答下面几题。

小题1:热带雨林被毁的直接原因是

A．雨林中土壤贫痔

B．自然灾害的影响

C．人类的开发

D．雨林生态的脆弱性小题2:热带雨林地区商业性伐木的原因是

A．借以获得更多的粮食

B．为不断增长的人口和移民提供就业机会

C．木材出口换取外汇，以偿还债务

D．扩大牧场，出口牛肉获取经济效益小题3:下列行动有利于亚马孙雨林保护的是

A．修建贯穿亚马孙雨林的公路

B．移民亚马孙平原

C．吸引国外投资者在此开辟肉牛牧场

D．建立自然保护区

目前一般认为银屑病为一种多基因病，其可能的病因有（）

A.遗传因素

B.感染

C.精神紧张

D.某些药物

Ragtime is a musical form that synthesizes folk melodies and musical techniques into a brief quadrille-like structure, designed to be played—exactly as written—on the piano. (46) A p analogy exists between European composers like Ralph Vaughan Williams and Edward Grieg, who combined folk tunes and their own original materials in larger compositions and the pioneer composers in the United States. Composers like Scott Joplin and James Scott were in a sense collectors or musicologists, collecting dance and folk music in Black communities and consciously shaping it into brief suites or anthologies called piano rags.

It has sometimes been charged that ragtime is mechanical. For instance, Wilfred Mellers comments, "rags were transferred to the pianola roll and, even if not played by a machine, should be played like a machine, with meticulous precision." (47)However, there is no reason to assume that ragtime is inherently mechanical simply because commercial manufacturers applied a mechanical recording method to it, the only way to record pianos at that date. Ragtime’s is not a mechanical precision, and it is not precision limited to the style of performance. It arises from ragtime’s following a well-defined form and obeying simple rules within that form.

The classic formula for the piano rag disposes three to five themes in sixteen-bar strains, often organized with repeats. (48)The rag opens with a bright, memorable strain or theme, followed by a similar theme, leading to a melody of marked lyrical character, with the structure concluded by a lyrical strain that parallels the rhythmic developments of the earlier themes. The aim of the structure is to rise from one theme to another in a stair-step manner, ending on a note of triumph or exhilaration. Typically, each strain is divided into two 8-bar segments that are essentially alike, so the rhythmic-melodic unit of ragtime is only eight bars of 2/4 measure. (49) Therefore, not concerned with development of musical themes, the ragtime composer instead sets a theme down intact, in finished form, and links it to various related themes that are brief with clear melodic figures. Tension in ragtime compositions arises from a polarity between two basic ingredients: a continuous bass—called by jazz musicians a boom-chick bass--in the pianist’s left hand, and its melodic, syncopated counterpart in the right hand.

Ragtime remains distinct from jazz both as an instrumental style and as a genre. Ragtime style stresses a pattern of repeated rhythms, not the constant inventions and variations of jazz. (50)As a genre, ragtime requires strict attention to structure, not inventiveness or virtuosity, existing as a tradition, a set of conventions, a body of written scores, separate from the individual players associated with it. In this sense ragtime is more akin to folk music of the nineteenth century than to jazz.

(49) Therefore, not concerned with development of musical themes, the ragtime composer instead sets a theme down intact, in finished form, and links it to various related themes that are brief with clear melodic figures.

捕获异常要求在程序的方法中预先声明，然后调用方法时，用【 】语句捕获并处理。

下列不属于环境行政责任形式的是：（）。

A、环境行政处分

B、环境行政处罚

C、环境行政赔偿

D、环境行政强制