一核酸的碱基构成情况是A=20%、C=30%、T=25%、G=25%,据此推测知,这一核酸的结构特点是()
A.双链DNA
B.单链DNA
C.双链RNA
D.单链RNA
参考答案:B
选择填空。
______ most of the young men, they do nothing on Sundays. [ ]
A.In
B.Of
C.For