题目

荷兰学者Frits．Went于1928年把燕麦胚芽鞘尖端切下，放在琼脂薄片上，约1h～2h后移去胚芽鞘尖端，将琼脂小块放在去顶的胚芽鞘一侧，然后置于黑暗条件下培养，胚芽鞘逐渐向放置琼脂小块的对侧弯曲生长,该实验结果不能直接证明的问题是（    ） A．胚芽鞘顶端能产生影响生长的物质 B．影响生长的物质自顶端向下运输 C．该物质能促进胚芽鞘的生长      D．单向光使该物质在胚芽鞘内呈不均匀分布  假设英语课上老师要求同桌之间交换修改作文，请你修改能同桌写的以下的作文。文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号(八；) ,并在其下面写出该加的词。删除:把多余的词用斜线(\) 划掉。修改:在错的词下划一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者(从第11处起) 不计分。    Our class recently went on the. school trip to an adventure centre. It is locating not too far away from the school. It only took us two hours get there by bus. There were twenty of ourselves and we spend five days there on a sailing course. The activities were good organised but safety standards were high. We enjoyed the courses although the weather was bad. Each student was given a lot of personal attention,who helped them to develop their confidence. I believe this course was good for all the students,and I think the school should organise a more similar trip next year.