A:由同一种元素组成的物质一定是单质
B:由同种分子构成的物质一定是纯净物
C:蜡烛燃烧后质量减小,不遵守质量守恒定律
D:凡是均一的、稳定的液体一定是溶液
下列河流易发生凌汛的是( )
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原谷谏父 原谷①有祖,年老,谷父母厌憎,欲捐②之。谷年十有五,谏③父曰:“祖育儿生女,勤俭终身,岂有老而捐之者乎?是负义也。”父不从,作舆④,捐祖于野。谷随,收舆归。父曰:“汝何以收此凶⑤具?”谷曰:“他日父母老,无需更作此具,是以收之。”父惭,悔之,乃载祖归养。注释:①原谷:人名。②捐:抛弃。③谏:好言相劝。④舆:手推的小车⑤凶:不吉利
如图的分类检索表中,鱼的类别应该位于( )
Sunday,June 1
Dear Tony,
Now we are having fun at Tian'anmen Square. The weather is fine. There are many people here. We'll visit the Bird's Nest and the Water Cube. In the evening,we'll have Beijing Duck. I love Beijing. I hope you will come to China soon.
Your friend,
Ben
Tony White__
78 Flower Road__
New York,CBE779D,USA