细菌的核质DNA构成是()
A.共价闭合环状双链
B.共价闭合单链
C.双链线状
D.单链线状
参考答案:A
In the name list, two names _____in particular: James and Susan, who are both top students in our school. [ ]
A. call up
B. stand for
C. call out
D. stand out
I'm sorry I forgot to write; I had so much else()my mind.
A.over
B.for
C.on
D.about