搜题请搜索小程序“爱下问搜题”
问题 读图填空题

下图是某一种生物细胞的示意图，根据图回答下列问题

（1）写出各部分的名称

A_________  B________  C________ D________  E_________

（2）图中D是_______存在的，所以，图中所示的细胞是_____细胞，而不是_______细胞。

（3）图中E表示的是D上的_______，实际上一对D上有_____对E，每对E都控制着某一个生物的_____，所有D上的全部的E控制着整个生物的_______。E的变化会造成_______的变异。这种变异是________的变异。

答案

(1)细胞膜    细胞质     细胞核    染色体    基因

(2)成对    体     生殖

(3)基因     数     性状     性状    性状     遗传

单项选择题

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.

57().

A.neither 

B.either 

C.one 

D.each
查看答案
单项选择题

下列有关胎儿成熟度的检查，哪项不正确：

A．胎头双顶径＞8.5cm，提示胎儿已成熟

B．羊水中L/S比值≥2，提示胎肺成熟

C．羊水中脂肪细胞出现率＞10%，提示胎儿皮肤已成熟

D．羊水中淀粉酶值≥450U/L，提示胎儿唾液腺已成熟

E．羊水中胆红素类物质△OD450＜0.02，提示胎儿肝已成熟
查看答案