题目

在观察果蝇唾液腺细胞染色体永久装片时，某同学在低倍镜下观察到了带有横纹的巨大染色体，下列说法错误的是（     ）A．染色体上的横纹是基因的所在地B．若一般体细胞DNA含量为2C，则装片上的唾液腺细胞DNA含量高于2CC．若视野中有明显的异物，可移动载玻片或转动目镜以判断异物在何处D．若在视野左侧有一横纹较为清晰的区段，应将载玻片左移使之位于视野中央_____ the morning of December 1st, 2006, the 15th Asia Games _____ in Doha(多哈).A. In, held B. On, was heldC. At, held D. For, were held