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分析某生物的双链DNA,发现腺嘌呤与胸腺嘧啶之和占全部碱基的64%,其中一条链上的腺嘌呤占该链全部碱基的30%则对应链中腺嘌呤占整个碱基的比例是( ) A 17% B 32% C34% D50%

A wiki is a space on the Web where you can share work and ideas, pictures and links, videos and media — and anything else you can think of. Wikispaces is special because we give you a visual editor and a bunch of other tools to make sharing all kinds of content as easy for students as it is for their teachers.

A Wikispaces Private Label site is a secure, dedicated wiki environment — like a clone of Wikispaces.com, but with your organization’s DNA mixed in. You get unlimited wikis (and everything you need to manage them), plus tools to integrate the site with your other systems and support your users.

gital driver's license

with complete confidence. Our online trainings show you how. More about parent professional development Research Credentials Check out our DNA. Our programs are built on respected digital ethics research. More about parent research credentials Turn wired students into great digital citizens Get all the tools you need with our FREE Digital Literacy and Citizenship Curriculum and Parent Media Education Program. The relevant, ready-to-use instruction helps you guide students to make safe, smart, and ethical decisions in the digital world where they live, study and play. Every day, your students are tested with each post, search, chat, text message, file download, and profile update. Will they connect with like minds or spill ... read more Get started Browse our classroom lessons and parent education resources by grade level or topical area. select gradeK123456789101112 select topicCell phones & digital communicationCyberbullying & online relationshipsDigital creation, plagiarism & piracyFamily media managementGaming & online worldsInternet safetyMedia's influence on kidsOnline privacy and securityOnline research & learningSocial networking & communityViolence in media Get Started Educator Updates Common Sense announces di gital driver's license Common Sense Media announced plans to create a digital driver’s license, an interactive online game that will teach kids the basics of how to be safe and responsible in a digital world. Read more about our plans for interactive curriculum modules

BBC - h2g2 - Culture and Civilization

To the psychologists, sociologists, and generational and media experts who study them, their digital gear sets this new group (yet unnamed by any powers that be) apart, even from their tech-savvy Millennial elders. They want to be constantly connected and available in a way even their older siblings don't quite get. These differences may appear slight, but they signal an all-encompassing sensibility that some say marks the dawning of a new generation.

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The difference is that these younger kids "don't remember a time without the constant connectivity to the world that these technologies bring," she says. "They're growing up with expectations of always being present in a social way — always being available to peers wherever you are."

If anything, stories like Ms. Portman’s show that great success, like DNA, is constructed of a few basic building blocks: tenacity, focus, and the old Woody Allen line about just showing up.