题目

下列各组液体混合物，用分液漏斗不能分开的是（ ）A. 水与煤油 B. 氯乙烷和水 C. 甲苯和水 D. 苯和溴苯 答案：【答案】D【解析】适用于用分液漏斗分离的应是互不相溶液体的分离。苯和溴苯相互溶解，不能分液分离。而煤油、氯乙烷、甲苯均不溶于水，可以分液分离，答案是D。 完形填空 　　When I was young, I belonged to a club that did community service work．There was one specific 　　1　　 that was unusual for me．I spent three or four hours handing out warm dinner to the homeless 　　2　　 in the streets．After that I went to a homeless shelter not far from the Bay Bridge． 　　I was in high school and at the time my sister was too young to 　　3　　．She wanted to help, 　　4　　 she made many chocolate chip cookies for me to 　　5　　 and hand out to people．When getting to the shelter, I passed out the 　　6　　．I began making sandwiches and 　　7　　 them with the crowd．I had the containers with my sister’s 　　8　　 in them and began to 　　9　　 around, offering them to anyone near me． 　　I approached an 　　10　　 gentleman and said, “ Sir, would you like a cookie?” He stopped and turned around, looked at me and said, “What did you say? Did you call me sir?” I told him I had, and his eyes 　　11　　 a little bit and said, “ No one has 　　12　　 called me sir．’ So he was completely moved． 　　It 　　13　　 me． 　　I explained I had been raised that 　　14　　 color and social status, everyone deserved respect．It 　　15　　 me to think that just because he was homeless, no one 　　16　　 him the honor．It broke my heart．I just didn’t understand 　　17　　 no one ever called him sir．I had never thought that anyone was below me because I wasn’t raised that way．Every 　　18　　 person deserves to be treated with respect．Years later, I still carry that memory and the 　　19　　 it taught me．Sometimes, what we take for granted can 　　20　　 make a difference in someone’s life． (1) [　　] A． case B． chance C． event D． accident (2) [　　] A． out B． far C． away D． off (3) [　　] A． participate B． decide C． choose D． go (4) [　　] A． however B． but C． yet D． so (5) [　　] A． enjoy B． eat C． collect D． take (6) [　　] A． papers B． meals C． books D． gifts (7) [　　] A． shared B． provided C． helped D． returned (8) [　　] A． dishes B． fruits C． cookies D． sandwiches (9) [　　] A． walk B． turn C． run D． show (10) [　　] A． well-dressed B． innocent C． old D． modest (11) [　　] A． watered B． cried C． opened D． closed (12) [　　] A． never B． ever C． still D． yet (13) [　　] A． encouraged B． attracted C． struck D． defeated (14) [　　] A． in spite of B． regardless of C． in case of D． because of (15) [　　] A． persuaded B． saddened C． frightened D． moved (16) [　　] A． handed B． offered C． reminded D． promised (17) [　　] A． what B． how C． whether D． why (18) [　　] A． single B． usual C． ordinary D． normal (19) [　　] A． lesson B． class C． truth D． reality (20) [　　] A． possibly B． nearly C． really D． usually