关于DNA双螺旋结构模型的描述正确的是( )
A. 腺嘌呤的克分子数等于胞嘧啶的克分子数
B. 同种生物体不同组织的DNA碱基组成不同
C. 碱基对位于DNA双螺旋的外侧
D. 两股多核苷酸链通过A与T或C与G之间的糖苷键连接
E. 维持双螺旋结构稳定的主要因素是氢键和碱基堆积力
-Have you finished your first paper?-_____.Just half of it. How about you?
A. Not at all
B. Not likely
C. Not a bit
D. Not yet
-Excuse me. How much is the shirt?-_____.
A. Extra Large
B. 50 each
C. It sells well
D. Altogether there are 5
-The Art Festival is coming. We’re going to watch the play Twelfth Night.-______
A. That ‘s all right
B. Never mind
C. You’re welcome
D. Enjoy your time