Many students know what they want to be in the future* . We think boys are different from girls. Here is a survey in Green High School. Let's look at the diagram* .
如果方程ax2+2x+1=0有两个不等实根,则实数a的取值范围是____ .
The new school _________ in the past five years.
中国近代史开端的标志是( )
How many____(图片)are there in your room?