DHealth officials issued a waring over common energy-saving l一ghtbulbs(灯泡) after research showed some types could potentially harm the skin and may even raise the risk of cancer.A study by the H
裸子植物和被子植物都是从_______进化来的。（ ） A.原始藻类 B.古代蕨类植物 C.古代苔藓植物 D.原始生命
— Did Peter fix the computer himself? — He _________, because he doesn’t know much about computers. A. has it fixed B. had fixed it C. had it fixed D. would f
毛泽东1941年11月6日在陕甘宁边区参议会发表讲话：“共产党员只有对党外人士实行民主合作的义务，而无排斥别人、垄断一切的权利。”以
植物细胞发生质壁分离的原因有 ①外界溶液浓度大于细胞液浓度 ②细胞液浓度大于外界溶液浓
物质的用途与其性质密切相关． （1）医疗急救时需要氧气，是因为氧气能 ． （2）用墨汁书写或绘制的字画能够保存很长时间不变色的原因是 ．
如图所示，两个相同的玻璃瓶分别装有质量相同的热水和冷水，下列说法正确的是( ) A. 热水中每个分子的动能都比冷水中每个分子的动能大 B. 热水的
When we talk about stars, especially women stars, it seems that they are always young, pretty and own charming body shapes. But recently a Britain’s Got Talent（英国达人）star Susan Boyle has
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