第2题: [单项选择]某双链DNA中已知一条链中A=30％、G=24％，下列其互补链的碱基组成正确的是（） A. T+C=46％ B. A+G=54％ C. A+G=46％ D. T+C=60％ E. A+T=46％ 参考答案:C 答案解析:根据双链DNA分子中两条链碱基互补原则，若一条链中A=30％、G=24％、则其互补链碱基T=30％、C=24％。即T+C=54％，A+G=46％。
第28题: [单项选择]A. The walls of the rooms are all well sound-proof. B. The house is just near a lane with less traffic. C. The main bedroom is far away from the street. D. The public security in the area is well enough. 参考答案:B 答案解析:[解析] Q: Why doesn’t the woman think it’s noisy living in the bedrooms
