题目

下列关于细胞结构和功能的叙述中，不正确的是（    ） A．根尖分生区细胞和叶肉细胞不是都有细胞周期，但化学成分却不断更新 B．抑制膜上载体活性或影响线粒体功能的毒素都会阻碍根细胞吸收无机盐离子 C．只有含叶绿体的细胞才能进行光合作用 D．乳酸菌、酵母菌都含有核糖体和DNA 答案：C 解析: 考查细胞结构和功能知识。C，如蓝藻细胞不含叶绿体，但也能进行光合作用。“USA? Britain? Which country is better to study in?”We often hear such discussions. As China opens its door, studying abroad has become a dream for many Chinese students. They would like to know the world well. It’s true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs. But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language and getting used to a different culture. Students must also learn to live without parents’ care and deal with all kinds of things they haven’t had to do before, like looking after themselves. There are reports about Chinese students abroad running into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well. Finally, studying abroad brings a heavy burden（负担）to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth it? We know that there are many famous people who have achieved success through their hard work in China.Liu Xiang is a good example. Once an American teacher invited him there, but he refused.He kept training hard with his Chinese teacher. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you wonder which country is better to study in, think again.Title: Studying at home or study    【小题1】   ? Phenomenon（现象） Studying abroad has become a 【小题2】  for Chinese students. Advantages It is helpful for Chinese students to   【小题3】   themselves. It is helpful for Chinese students to  【小题4】   foreign language skills. It enables Chinese students to find jobs more  【小题5】 . 【小题6】 It   【小题7】   Chinese students too much time to learn a foreign language. It’s hard for Chinese students to get used to the life abroad 【小题8】    parents’ care. Parents may be under pressure（压力）because the cost of studying abroad is very 【小题9】  . Purpose: To tell us studying abroad is not the only way to be   【小题10】   by describing Liu Xiang’s example.