A. On every continent but not in every country． B. On the continents with developed countries． C. On the continents with developing countries． D. On every continent and in every country．
A. 富含AT的区域 B. 富含GC的区域 C. 核小体之间的连接 D. 已经发生DNA损伤的部位 E. DNA的任何区域
A. Talk with confident people． B. Set up achievable goals． C. Be aware of your achievements． D. Award yourself more frequently．
A. 红细胞 B. 表皮细胞 C. 白细胞 D. 上皮细胞 E. 神经细胞
微信支付 
支付宝支付