问题
判断题
转座元两端通常都存在同向重复序列和倒转重复序列，研究表明这些序列对于转座元的转座作用非常重要。( )
答案
参考答案：错
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转座元两端通常都存在同向重复序列和倒转重复序列，研究表明这些序列对于转座元的转座作用非常重要。( )
参考答案：错
| 短文改错。 | |
| The earliest coins in world were used in China from about 650 BC. Coins may be of different in size, weight and shape, and they may be made from different metals, Usually they have different designs on the two sides. There is usually the head of the well known person on one side. Today the coin is marked by the name of the country, the date and its valuable. In the past, many things could be used for money, such like seashells, rings, bamboo sticks, wood and so on. The earliest coin in the west were made of gold, mixed with silver. Much collections of coins were discovered. The largest collection found in Britain contained about 200 000 silver penny that were all over 600 years old. | 1.____ |