题目

下列各组电极材料和电解质溶液中，不能组成原电池的是( ) A．铜片、石墨棒、稀硫酸 B．铜片、石墨棒、硝酸银溶液 C．锌片、铜片、稀盐酸 D．铜片、铁片、FeCl3溶液 答案：解析：原电池的电极材料是活泼性不同的金属或能导电的非金属，同时负极金属要与电解质溶液能发生自发的氧化还原反应，A项中铜与稀硫酸不发生反应，故选A。 答案：ALanguage is a way to communicate with each other. We started to learn language when we were born. However, people are used to speaking their native language, so immigrants are having many problems between the first generation and the second generation because they don’t have the same native language. Also, the second generation is losing their identity. Especially in America, there are many immigrants that came from different countries to succeed in the States. Because they suffer in lots of areas such as getting a job and trying to speak English, they want their children to speak English, not only at school, but also at home in order to be more successful. Because of this situation, their children are losing their identity and, even more, they are ignoring their parents whose English is not very good. I think most immigrants are trying to preserve their native language in their new country, but this doesn’t help very much in getting a good job. My aunt taught Korean to her children not to help them succeed in the U.S. She did so, hopefully, to help them establish a Korean identity. Though the second generation was born in the new country, they often get confused about their identity because they look different from others, and also, if they visit their parents’ country, they will probably feel different from other people there too. My cousins told me that when they visited Korea a few years ago, they felt different from other Koreans. They could even feel it just strolling around the street because they wore different clothes and walked differently. We must realize that language is important and valuable for many reasons. Immigrants should make an effort not to be ignored by their children and let them understand their background by teaching them the parents’ language. This is very important, not only for the harmony of the family, but also in helping the second generation establish their identity. 1. According to the text, what is the problem of the first generation immigrants? A. They have lost their identity. B. Their children are losing their identity. C. Their children speak different languages. D. They cannot speak their native language. 2. My aunt taught her children Korean__________. A. so that they knew they were of Korean origin. B. so that they would be more successful in the U. S. C. because she didn’t want them to speak English D. because she wanted them to respect her 3.The writer’s cousins felt different in their parents’ country because they_________. A. had never been there before B. behaved quite differently C. couldn’t understand the language D. had different facial appearance 4.According to the text, the native language is important and valuable to immigrants because________. A. it gives them self-confidence and better chance B. it makes the second generation love motherland C. it helps the second generation to understand their parents D. it strengthens the family ties and reminds them of their identity