题目

从某生物组织中提取DNA进行分析，其中鸟嘌呤与胞嘧啶之和占全部碱基总数的46%。又知该DNA的一条链(H链)所含的碱基中28%是腺嘌呤，问与H链对应的另一条链中腺嘌呤占该链全部碱基数的( ) A．42%                   B．27% C．26%                   D．14%   答案：CListen and fill in the blanks（听录音，填空） (1)Tom likes ________. (2)Jack likes ________ to school. (3)Sue likes ________ to music.