卵巢肿瘤TNM分期中的T1a期是指（）

A.肿瘤限于一侧卵巢，被膜完整，卵巢表面无肿瘤，腹水或腹腔冲洗液中未见恶性细胞

B.肿瘤限于双侧卵巢，被膜完整，卵巢表面无肿瘤，腹水或腹腔冲洗液中未见恶性细胞

C.肿瘤限于一侧或双侧卵巢，伴有以下任何一种情况：被膜破裂；卵巢表面有肿瘤；腹水或腹腔冲洗液中有恶性细胞

D.肿瘤蔓延和（或）子宫种植和（或）输卵管种植；腹水和腹腔冲洗液中无恶性细胞

E.肿瘤蔓延至其他盆腔组织；腹水和腹腔冲洗液中无恶性细胞

Geography is the study of the relationship between people and the land. Geographers compare and contrast various places on the earth. But they also (51) beyond the individual places and consider the earth as a whole. The English word geography means "to describe the earth. " (52) geography books focus on a small area like a town or city. Others deal with a state, a region, a nation, or an (53) continent. Many geography books deal with the whole earth. Another (54) to divide the study of geography is to distinguish between physical geography and cultural geography. The former focuses on the natural world; the (55) starts with human beings and studies how human beings and their environment act (56) each other. But when geography is considered as a single subject, (57) branch can neglect the other. A geographer might be described as one who observes, records, and explains the (58) between places. If all places (59) alike, there would be little need for geographers. We know, however, that no two places are exactly the same. Geography, (60) is a point of view, a special way of looking at place.

60().

A.still 

B.then 

C.nevertheless 

D.moreover