“如果生活只有风和日丽而没有阴雨笼罩，只有幸福而没有悲哀，只有欢乐而没有痛苦，那么，这样的生活根本就不是生活——至少不是人的生活。”这说明（   ）

增加：在缺词处加一个漏字符号(∧), 并在此符号下面写出该加的词。

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）只允许修改十处, 多者(从第11处起) 不计分。

    Every morning Steve goes to work by the train. As he has a long trip, he always buys a newspaper. It helps make the time passing more quickly. One Tuesday morning, he turned to the sports page. He wants to read the report about a important football match the night before. The report was very interesting that he forgot to get off at his station. He did not know it unless he saw the sea. He got off at next station, and had to wait a long time for a train to go back. Therefore, he arrived late at the office, that made his boss very angry. When Sieve told to him why he was late, “Work is very important than football!” He shouted.

一条多肽链中有氨基酸1000个，作为合成该多肽链模板的mRNA分子和用来转录成mRNA的DNA分子，至少含有碱基的数量分别是（　　）