右图是对动物细胞有丝分裂时染色体数（a）、染色单体数（b）和DNA分子数（c）的统计图，下列解释肯定不正确的是（ ） A、①可以用于
在不需要考虑物体本身的大小和形状时，可以把物体简化为一个有质量的点，即质点。物理学中，把这种在原型基础上突出问题的主要方面，忽略次要
III 完型填空 15% Reports about stolen virtual property(虚拟财产), (for example, the money that is gained through Web games,) are becoming increasingly frequent. W
The magnitude 7.9 quake struck Sichuan province on May 12 at around noontime, which may have increased the human death toll because many people w
It to look after these naughty grandchildren of mine for a whole day. A. put me down B. drove me out C. wore me out D. pulled me through
读地球上的五带示意图，完成下列各题。 （1）写出图中字母所代表的五带名称： A、 _______ B、_______ C、_______ D、_______ E、_______ （2）图中A带
My brother usually goes to bed half eight in the evening. A. at; past B. at; to
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