题目

     Thousands of jobs come into our Job Centre every week, but they get snapped up (抢购)quickly. So although we shall do all we can to help you, it's important for you to do all you can to help yourself. This passage tells you how.     Registered (注册) for work                                           Once you have registered for work we will match you will available vacancies. If you want to claim unemployment benefit (失业津贴), you also have to get registered at our Job Centre. But you actually apply for and claim it at the local 细胞内某一DNA片段中有30％的碱基为A，则该片段中（ ）A. G的含量为30％ B. U的含量为30％C. 嘌呤含量为50％ D. 嘧啶含量为40％