排序。
A. There are five books on the table.
B. It's small, but it's clean.
C. There is a doll on the bed.
D. Look! This is my room.
E. I like my room.
F. There is a table and a bed in my room.
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下列有关生物学实验原理和技术操作的叙述中,正确的是( )
“朦朦胧胧张眼一瞧,黑暗里突然突出一线红。这是什么?﹣﹣原来是北极下来的新潮,由近东卷到远东.”是民国七年刘大白写的《红色中华》中的几句诗,它的创作背景是( )
下列行为属于负责任的表现的是 ( )