题目

某DNA分子中A＋T占整个DNA分子碱基总数的44%，其中一条链(a)上的G占该链碱基总数的21%，那么，对应的另一条互补链(b)上的G占该链碱基总数的比例是 A.35%         B.29%            C.28%              D.21% 答案：AThe president expressed his satisfaction with the co-operation,       that he hoped to have another one.A．addingB．addedC．to addD．having added