读一读,先把句子代码填入正确的括号里,再给图涂上相应的颜色。
A. I can see a ball. It's yellow. B. I can see a slide. It's red.
C. I can see a seesaw. It's blue. D. I can see a swing. It's green.
石油醚经常被用作植物有效成分提取时的萃取剂,其原因是( )
下列4个数中3.1415926, 227 , , 36 ,其中无理数是( )
请你阅读《宪法》目录并判断后面的说法,正确的一项是( )