下列各组物质中，互为同素异形体的是 A．H2O和H2O2 B．CO和CO2 C． 发布时间：2017-06-03 14:19 │ 来源：www.tikuol.com 题型：选择题 问题： 下列各组物质中，互为同素异形体的是 A．H2O和H2O2B．CO和CO2C．O2和O3D．Mg和Mg
题型：选择题 完形填空。 Near our school there is a store. It's 1 but there're _ 2 of school things. Do 3 like exercise books, erasers, pens 4 color pencils? They are. 5 . Big erasers are just one yuan 6 and small ones are only 0.5 yuan. The color pencils are just 7 2 yuan.l want the cartoon pencil sharpener. It is 8 expensive, either. I will take 9 .Do you want some school things for yourself? Just come 10 this store.( )1. A. big ( )2. A.lots ( )3. A.I ( )4. A. so ( )5. A. expensive ( )6. A. one ( )7. A. for ( )8. A. not ( )9. A. them ( )10. A. for B. small B. lot B. they B. and B. cheap B. every B. on B. no B. it B. up C. long C. many C. you C. but C. dear C. each C. in C. / C. that C. to 查看答案
Mg和
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