题目

下列物质中，都是由极性键构成的非极性分子的一组是（       ） A、CH4与N2      B、NH3与H2O    C、CO2与CH4      D、HCl与CO2 答案：C首字母填空：根据短文内容及首字母提示，填写所缺单词My name is Lily, I am friendly and honest. I am good at English and M1.. I like playing computer games, r2. books and traveling. I also like playing table tennis. And I want to b3. a famous table tennis player when I grow up. What I like most is to see the birds flying freely in the sky. Of all the subjects, I like English best b4. I have a good English teacher, Mrs. Liu. We respect and love h5. very much.Mrs. Liu w6. very hard. She is always the first to come and the l7. to leave her office. She tries to make her classes lively and interesting. And we like her l8. very much.Mrs. Liu is very k9. and friendly to us. And we’re getting on well with each other. She teaches us so well that we all enjoy learning English. A10. the students think she is one of the most popular teachers in our school.