题目

Magazine Articles: More Valuable Than You May ThinkParents are often surprised when teachers suggest their children read magazines. Read on to learn about the benefits that reading magazines offers to young readers and how to introduce your children to the medium.Magazine BenefitsMagazine articles can provide reluctant readers with a lively, breezy writing style that can inspire them to read more.The articles in magazines are generally short, which allows a child to finish reading a feature article without losing interest due to a short attention span. The writing in magazines also tends to be在人体细胞中，由A、G、U三种碱基可构成多少种核苷酸 A．3种                B．4种                 C．5种               D．6种