问题
填空题
大肠并不进行消化，大肠中物质的分解也多是细菌作用的结果，某些细菌可以利用肠内较为简单的物质合成（）族维生素和维生素K。
答案
参考答案：B
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大肠并不进行消化，大肠中物质的分解也多是细菌作用的结果，某些细菌可以利用肠内较为简单的物质合成（）族维生素和维生素K。
参考答案：B
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| In many classrooms, it's not 1 to find students spinning (旋转) their pens 2 they listen to their teachers. Pen-spinning is also popular 3 Japanese students. It is a form of entertainment. Recently, a pen-spinning competition was held in Tokyo, Japan. Ryuki Omura, a 16-year-old high school student, became the first pen-spinning 4 . 276 people took part in the competition. The came from different age groups. Some were students 5 some were office workers. First, they 6 the videos of their pen-spinning skills to the organizer's website. Then some of them came to the last round in Tokyo. 7 of them had 30 seconds to show their skills in front of 400 people, 8 reporters and fans. Omura took a pen from his little finger to the rest fingers, then to his palm (手掌) and the back of his hand. His wonderful show made him 9 the champion. Omura said he began learning pen-spinning only about 14 months ago. He did 10 in the competition. If you like to spin your pen, you can practice it in your spare time. But when you are in the class, please don't do that. | |||
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