题目

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 People living in the country enjoy several advantages that people living in the city cannot enjoy.     _________They make friends with trees and stones. They breathe fresh air. They fight with strong winds. ________.     This contact with nature is good for health. There are many diseases that are common in the city, but are not to be found in the country, For example, near-sightedness is almost unknown to country people.     Because of the absence of cars, one can如图是植物细胞和动物细胞的结构示意图，据图回答问题：（1）属于植物细胞的是 图，你判断的依据是 ；图中B的主要作用是 ．（2）细胞生命活动的控制中心是（填字母） ，其中含有的遗传物质是 ．（3）植物细胞和动物细胞共有的结构有B 、C 、D ．（4）图中结构E名称是 ，它是进行 作用的场所．（5）西瓜之所以甘甜可口，主要是 （填字母）中含有大量细胞液；在显微镜下呈缓缓流动的结构是 （填字母）．（6）在用显微镜观察细胞结构时，常用的染色试剂是 ，在细胞结构中染色最深的是 （填字母）．