A
Join AAAS to unlock access to the latest science news and research—and to support the people making it happen．
When you join AAAS，the publisher of Science，you’re not just getting the latest news and research from across the globe．You also become part of the world’s largest general scientific society —a real community of scientists and science supporters．
Your membership helps us maintain support for science education，advocate for responsible public policies，and advance science for the benefit of a11．
All memberships include 50 issues of Science，with your choice of print or distal delivery．You’ll also get unlimited access to all our online articles at sciencemag．Org—from any device and anywhere—and lots of other exclusive AAAS benefits．
Become a member today for as little as $50 and we’11 a1so send you a limited-edition T-shirt—but only while supplies last．Hurry and join now!
Please choose your AAAS membership and Science delivery type.
All memberships include weekly issues of Science，unlimited access to Science News online，and other exclusive AAAS benefits．
21．What extra benefit will you get if you become a member of AAAS right now?
A．$50 as a reward． B．50 issues of Science．
C．A limited-edition T-shirt． D．Unlimited access to online articles．
22．Which membership type charges the most for digital delivery?
A．Regular． B．Post Doc． C．Retired． D．Science Advocate．
23．What’s the purpose of the text?
A．To introduce a magazine． B．To invite people to join AAAS．
C．To advertise a website． D．To show AAAS member benefits．
