某双链DNA分子片段含腺嘌呤156个,占该片段全部碱基总数的26%,则该分子片段中鸟嘌呤应有()。
A.600个
B.300个
C.156个
D.144个
参考答案:D
The old couple decided to ______ a boy and a girl though they had three of their own.
A.adapt
B.admit
C.abandon
D.adopt
体育随社会经济发展的趋势性表现为:()管理趋势和()管理趋势。