问题
多项选择题
硅胶由（）组成的固体吸附剂。
A.二氧化硅
B.氧化钠
C.三氧化二铁
D.其他硫酸盐
答案
参考答案：A, B, C, D
搜题请搜索小程序“爱下问搜题”
硅胶由（）组成的固体吸附剂。
A.二氧化硅
B.氧化钠
C.三氧化二铁
D.其他硫酸盐
参考答案：A, B, C, D
| 1. 分别将下列词汇的标号填入合适的空格内。 |
| A. France B. excited C. educational D. tea E. Japan F. embarrassed G. peaceful H. alarm clock I. Brazil J. surprised K. umbrella L. car M. England N. exhausted O. exotic P. fantastic (1) I'd like to go to a ____ ____ _____ _____ place. (2) He feels ____ ____ _____ _____ songs. (3) If I had money. I would go to ____ ____ _____ ____ (4) There are some great inventions ____ _____ _____ _____ |
| 2. Which invention do you think is the most important invention? Why? |