题目

线粒体DNA上的基因所表达的酶与线粒体功能有关。若线粒体DNA受损伤，则下列细胞的功能受影响最大的是 A．红细胞吸收葡萄糖                B．小肠上皮细胞吸收水 C．神经细胞吸收K＋                 D．肺泡细胞吸收氧气 答案：C选择填空 (共10小题, 每小题1分)In Singapore, many middle school students spend a lot of time on their studies. Many of them try their best   1  good marks in the exams. They have a lot of homework every day, and the exam is a big headache. In their mind, good   2  is the ticket to success in the future.Singaporean students study hard, but they have a lot of fun after class. Do you want to know what   3  they like to do after class? They can   4  all kinds of sports and games, music and dance, hiking and rock-climbing. They are also very active in community service.In their free time, most students like to listen to pop music. Hollywood movies are very popular with them. They also like movies   5  in Hong Kong and Singapore because they understand them very well. Some students   6  their free time surfing the Internet,   7  e-mails to their friends and playing computer games.   8  they also go to shopping centers and big bookstores. They are really good places to   9  . So as a middle school student, living in Singapore is not easy, but it is  10  .Dear students, what about your school life? Please write something about it.【小题1】A．gettingB．getC．to getD．gets【小题2】A．memoryB．healthC．friendD．education【小题3】A．jobsB．activitiesC．choicesD．abilities【小题4】A．joinB．take partC．attendD．take part in【小题5】A．makeB．makingC．madeD．to make【小题6】A．payB．spendC．costD．take【小题7】A．sendingB．receivingC．playingD．getting【小题8】A．NeverB．SometimesC．HardlyD．Seldom【小题9】A．relaxB．stopC．travelD．walk【小题10】A．boringB．difficultC．colorfulD．hard