如图为某反射弧的部分模式图（C为组织液）。下列叙述正确的是（）
A.与A端相连接的效应器指的是传出神经末梢及其所支配的肌肉或腺体
B.兴奋在反射弧上传递时，C处发生的信号变化是电信号—化学信号—电信号
C.刺激D点，在E处测到电位变化，不能说明兴奋在神经元之间的传递是单方向的
D.把某药物放在C处，刺激E点，D处没电位变化，说明该药物对兴奋在神经元之间
的传递有阻断作用
参考答案：C
| 完形填空。 | |||
| Tango is one of the most fascinating of all dances.__1__in Spain or Morocco,the Tango was__2__to the New World by the Spanish settlers. The story of Tango as told is that it started with the gauchos (加乌乔牧人) of Argentina. They would go to the crowded night__3__and ask the local girls to dance.Since the gaucho hadn't __4__,the lady would dance in the crook of the man's right arm,__5__her head back. Her right hand was held low on his left hip,close to his__6__,looking for a payment for dancing with him.The man danced in a curving fashion because the floor was__7__with round tables,so he danced around and between them. The dance__8__throughout Europe in the 1900s.Originally popularized in New York in the winter of 1910-1911,Ru  dolph Valentino then made the Tango a__9__in 1921.As time passed,the dance was finally considered__10__even in Argentina. __11__vary in Tango: Argentine,French,Gaucho and International.Still,Tango has become one of American "Standards"__12__its origin.The Americanized version is a__13__of the best parts of each.The__14__involved are the same for any good dancing.First,the dance must fit the music. Second,it must contain the basic characteristic that__15__it apart from other dances.Third,it must be__16__and pleasing to do. Tango music is like a__17__.It contains paragraphs (Major phrases)；sentences (Minor phrases)；and the period at the__18__of the sentence is the Tango close. For exhibition dancing,a Tango dancer must develop a strong__19__with the music,the dance and the audience.The audience can only feel this connection if the__20__feels and projects this feeling.So it is when dancing for your own pleasure-and your partner's! | |||
| ( )1. A.Originating ( )2．A.taken ( )3．A.meetings ( )4．A.rained ( )5．A.striking ( )6．A.wallet ( )7．A.big ( )8. A.spread ( )9．A.dance ( )10．A.respectable ( )11．A.Paces ( )12．A.because of ( )13．A.method ( )14．A.principles ( )15．A.takes ( )16．A.powerful ( )17．A.comedy ( )18．A.end ( )19．A.connection ( )20．A.musician | B．Suffering B．thrown B．houses B．showered B．holding B．trousers B．slippery B．expanded B．hit B．enjoyable B．Styles B．regardless of B．motivation B．objects B．brings B．practical B．book B．beginning B．feeling B．composer | C．Happening C．introduced C．clubs C．rested C．bending C．pocket C．flat C．distributed C．game C．affordable C．Times C．in favor of C．combination C．purposes C．puts C．comfortable C．notice C．sight C．desire C．director | D．Appearing D．instructed D．stores D．smiled D．trying D．body D．small D．exploded D．play D．reasonable D．Countries D．out of. D．reference D．restrictions D．sets D．manageable D．story D．foot D．potential D．performer |