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Huguangyan National Scenic Spot
Huguangyan National Scenic Spot is in the south part of Zhanjiang. It is 18 km away from Zhanjiang. The
scenic spot mainly consists of the volcanic (火山) lake and the basalt (玄武岩) rock-groups around the lake.
The total area of the spot covers 13.6 square kilometers with a protection area of 38 square kilometers. The
water area of the lake amounts to 2.3 square kilometers. In 1997, The UNEarth Research Center and Earth
Research Institute of China Scientific Institute assessed (评估) that Huguangyan was formed about 140,000
to 160,000 years ago after the volcanic eruption (火山爆发). Lots of samples indicate that the lake is a rare
Maar Lake in the world after the volcanic eruption in the plain area.
Huguangyan National Scenic Spot
Situation1 ______Zhanjiang
Consist 2 ______and the basalt rock-groups
The area of the spot 3 ______square kilometers
The area of the lake4 ______square kilometers
Form about 5 ______years ago

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【单选题】2008年9月,中国爆发三鹿婴幼儿奶粉受污染事件,导致食用了受污染奶粉的婴幼儿产生肾结石病症,其原因就是奶粉中含有三聚氰胺。下列描述属于三聚氰胺的化学性质的是 [ ]

A.
三聚氰胺性状为纯白色单斜棱晶体,无味;
B.
快速加热升华,升华温度300℃;
C.
溶于热水,微溶于冷水,极微溶于热乙醇;
D.
在一般情况下较稳定,但在高温下可能会分解放出氰化物。