A:腺嘌呤
B:鸟嘌呤
C:胞嘧啶
D:胸腺嘧啶
根据句意,用括号中所给单词的适当形式填空。(1)What ____ you____ (do) this Monday? There____ (be) a football match.____ you ____ (go) with us?(2)I ____ (go) to see you as soon as I get to Beijing.(3)I think it ____ (be) rainy tomorrow.(4)My father ____ (send) me a new bike when I am tall enough.(5)We____ (visit) the Great Wall next week.(6)Who ____ (give) us a talk on the computer in two days?(7)They ____ (build) a new modern house near the river next year.(8)I want to know if he____ (be) back tomorrow.
河流的中下游河段侧蚀作用明显,河流不断地侵蚀河岸、扩展河床,致使河道不断弯曲,以致河道变迁。读某河段曲流分布示意图,回答下列各题。
读西亚石油海上运输路线图,完成下列要求。
由图中可以看出:
运输路线①从A____ 湾,经C____ 运河;运输路线②经____ 洋和____ 洋;①②都是到达D____ 洲。运输路线③经____ 洋,一部分到达B____ (国家),大部分穿过东南亚的____ 海峡,再经____ 洋,最后到达F____ (国家)。
读我国水土流失严重地区分布图回答下题。