草类纤维原料灰分含量一般比木材高，而且60%以上是（）.
参考答案：SiO2
圣诞节到了，你知道该怎样装扮圣诞树吗？排列句子。
( ) First, put on the lights.
( ) Then, put the star on the top.
( ) It's fun to put up a Christmas tree.
( ) There! It's done! How beautiful!
( ) Second, put Christmas things on the tree.
( ) Now, put our gifts under the tree.
